Well I got a check engine light P0420 bank 1, I am more less going with my thought that the car has 91,000 and it has never had the o2 replaced and it is now due for a replacement. This seems like the problem to me since the car is running a slight bit more sluggish than normal.
2009 Ford Mustang V6
Another thought: The sensor is OK and what it is suppose to sense is bad.
Im getting that code too.
Pacesetter header, Hi-flo cat (magnaflow something), pacesetter catback
I had the same setup on my sunfire and it didnt throw a code (had it on there for maybe 8 months... i think). Im thinking o2 sensor on mine, just cant spring for a new one quite yet.
I would doubt the sensor is okay at 91,000 they should usually be changed around 60,000 I thought.
2009 Ford Mustang V6
You may be right. Im not sure on a scheduled change or anything for those sensors, but if youre getting an o2 code at 91k id assume the sensor is in need of replacing.
I was at 73k on my 'fire and im at 75k on my Cav.
However, i deleted mine a while ago and it took like 2 weeks (about 1000 miles) for it to come back. I just havent done anything about it since lol.
Well it came back so I used my friends live data scanner and my rear o2 is pretty much dead.
2009 Ford Mustang V6
I am also having this problem I have a Pacesetter header, Magnaflow cat and custom bent 2.5" exhaust all the way back. The car only has 38000 on it and the engine has like 9000. What can be the problem? The cat is only like 6 months old.
We Ride Together, We Die Together...... J-Bodies For Life!
SPONSORED BY: Showstopper Tuning, JM Graphics
2003 Cavalier LS Sport "SHOCKWAVE"
Quote:
Well it came back so I used my friends live data scanner and my rear o2 is pretty much dead
What did the data scanner show you?
The voltage of the rear sensor does not change much when it is OK. If it changes a lot like the front sensor, then the catalytic converter is bad.
On my cavalier which has no problems and just passed a DriveClean emission test, the rear O2 sensor behaves as follows: During city driving, the voltage is between 0.6 and 0.8 volts. When driving on the highway at a steady speed for 10 minutes, the voltage slowly drops to about 0.45-0.5volts. When coasting from highway speed to a almost standstill (no brakes) the voltage goes down to zero volts. And the voltage rises quickly to about 0.7volts when I start driving again.
i also recived this code i have no exhaust modifactions the car has like 124,000 miles and i do not know if eitrher 02 sensor has been replaced i don't have to run emmisions and the engine is running better than normal i resrt the code and other is there something i need to worry about or can i drive the car untill it becomes a problem
there is no smoke coming out of tail pipe and oil maintains the same level
I got this after replacing my ICM since I was getting P0300 (Multiple Random Cylinder Misfire). It cleared the misfire up but I got this code after about 25 miles. What are the chances it got a bad reading to the O2 sensor after the cylinders were misfiring?
I only drove the car about a half of a mile after I got the CEL and before I replaced the ICM.
Dan Trump
2004 Cavalier LS Sport - Victory Red
I had to replace my ICM about a week ago. I was driving down my driveway and it popped and dropped 2 cylinders. Ever since then I had the P0420 code. Last night I changed the front O2 sensor hoping that's what it means by bank 1. When I pulled it out, it was more carboned up than any sensor I've seen. The only thing I can think of is that when I dropped the cylinders I washed the sensor with raw gas and burned it up.
I'll see what happens, so far 20 miles on new sensor and no code. If not.......it had 65k on it....it was due for a change.
P0420 is catalyst below threshold efficiency, which basically means that the catalytic converter is not doing its job and filtering all of the stuff that its supposed to. Many times this will come on when you have a high flow cat or when you don't have a cat at all, as far as checking voltage on an O2 sensor it never surpasses more than 1volt it usually stays between .4 and .8 volts.
Yep....light came back on.....so much for the easy fix....the cat is dead.
Time to get hpt .....
Could also be the sensor behind the cat
I am looking in SI right now and it says it could be a bad sensor or cat
I would start with the 2nd sensor first then do the cat
Any one found a answer to this yet
When I had this code it was my downstream o2 sensor. I put a Walker o2 in and now its all good and is now reading correctly.
Just replaced downstream after I put headers and catback upstream have not replaced yet
O2 sensors don't expire and quit working when they're old. Easy way to check what the problem is with emissions is this. Warm up your car thoroughly. Use an infrared thermometer and point it at your catalytic converter, front and back of it. There should be a 100-200F difference, the back should be hotter. This would indicate that the converter is catalysing Nox and such. If it's less than 50F difference then the converter is bad. Take the temperature readings with the car running.
I'm still trying to fight this problem on my car. I used my scan tool and recorded the both 02 sensor readings. This was recorded after the car had been run up to operating temp for a while. I also had just changed the plugs and seafoamed the car before I recorded this. I notice that the front 02 sensor seems to be working right. Bounces from low to high. The rear 02 sensor seems to telling the car I'm running rich. There are also a couple spots where the rear 02 voltage goes over 1 volt and sometimes drops down to .1 or .2 volts Thoughts?
Recorded Data
O2S11 V 0.115
O2S12 V 0.700
Frame -5 Time -0.4
O2S11 V 0.125
O2S12 V 0.695
Frame -4 Time -0.3
O2S11 V 0.165
O2S12 V 0.690
Frame -3 Time -0.2
O2S11 V 0.505
O2S12 V 0.685
Frame -2 Time -0.2
O2S11 V 0.800
O2S12 V 0.680
Frame -1 Time -0.1
O2S11 V 0.880
O2S12 V 0.680
Frame 0 Time 0.0
O2S11 V 0.860
O2S12 V 0.735
Frame 1 Time 0.2
O2S11 V 0.820
O2S12 V 0.750
Frame 2 Time 0.3
O2S11 V 0.710
O2S12 V 0.750
Frame 3 Time 0.4
O2S11 V 0.250
O2S12 V 0.740
Frame 4 Time 0.4
O2S11 V 0.130
O2S12 V 0.735
Frame 5 Time 0.5
O2S11 V 0.115
O2S12 V 0.725
Frame 6 Time 0.6
O2S11 V 0.115
O2S12 V 0.710
Frame 7 Time 0.7
O2S11 V 0.125
O2S12 V 0.700
Frame 8 Time 0.8
O2S11 V 0.245
O2S12 V 0.700
Frame 9 Time 0.9
O2S11 V 0.570
O2S12 V 0.695
Frame 10 Time 1.0
O2S11 V 0.800
O2S12 V 0.695
Frame 11 Time 1.0
O2S11 V 0.855
O2S12 V 0.695
Frame 12 Time 1.1
O2S11 V 0.835
O2S12 V 0.725
Frame 13 Time 1.2
O2S11 V 0.745
O2S12 V 0.735
Frame 14 Time 1.3
O2S11 V 0.375
O2S12 V 0.730
Frame 15 Time 1.4
O2S11 V 0.145
O2S12 V 0.725
Frame 16 Time 1.5
O2S11 V 0.120
O2S12 V 0.715
Frame 17 Time 1.6
O2S11 V 0.120
O2S12 V 0.705
Frame 18 Time 1.6
O2S11 V 0.125
O2S12 V 0.700
Frame 19 Time 1.7
O2S11 V 0.190
O2S12 V 0.695
Frame 20 Time 1.8
O2S11 V 0.460
O2S12 V 0.690
Frame 21 Time 1.9
O2S11 V 0.745
O2S12 V 0.685
Frame 22 Time 2.0
O2S11 V 0.855
O2S12 V 0.685
Frame 23 Time 2.1
O2S11 V 0.845
O2S12 V 0.700
Frame 24 Time 2.2
O2S11 V 0.790
O2S12 V 0.730
Frame 25 Time 2.2
O2S11 V 0.635
O2S12 V 0.730
Frame 26 Time 2.3
O2S11 V 0.275
O2S12 V 0.725
Frame 27 Time 2.4
O2S11 V 0.130
O2S12 V 0.720
Frame 28 Time 2.5
O2S11 V 0.115
O2S12 V 0.710
Frame 29 Time 2.6
O2S11 V 0.115
O2S12 V 0.700
Frame 30 Time 2.7
O2S11 V 0.120
O2S12 V 0.690
Frame 31 Time 2.8
O2S11 V 0.215
O2S12 V 0.680
Frame 32 Time 2.8
O2S11 V 0.575
O2S12 V 0.680
Frame 33 Time 2.9
O2S11 V 0.715
O2S12 V 0.675
Frame 34 Time 3.0
O2S11 V 0.745
O2S12 V 0.670
Frame 35 Time 3.1
O2S11 V 0.735
O2S12 V 0.670
Frame 36 Time 3.2
O2S11 V 0.610
O2S12 V 0.670
Frame 37 Time 3.3
O2S11 V 0.220
O2S12 V 0.670
Frame 38 Time 3.4
O2S11 V 0.125
O2S12 V 0.670
Frame 39 Time 3.5
O2S11 V 0.120
O2S12 V 0.665
Frame 40 Time 3.5
O2S11 V 0.130
O2S12 V 0.665
Frame 41 Time 3.6
O2S11 V 0.145
O2S12 V 0.665
Frame 42 Time 3.7
O2S11 V 0.360
O2S12 V 0.660
Frame 43 Time 3.8
O2S11 V 0.705
O2S12 V 0.660
Frame 44 Time 3.9
O2S11 V 0.820
O2S12 V 0.655
Frame 45 Time 4.0
O2S11 V 0.820
O2S12 V 0.655
Frame 46 Time 4.1
O2S11 V 0.795
O2S12 V 0.660
Frame 47 Time 4.1
O2S11 V 0.640
O2S12 V 0.665
Frame 48 Time 4.2
O2S11 V 0.250
O2S12 V 0.675
Frame 49 Time 4.3
O2S11 V 0.130
O2S12 V 0.670
Frame 50 Time 4.4
O2S11 V 0.115
O2S12 V 0.670
Frame 51 Time 4.5
O2S11 V 0.115
O2S12 V 0.660
Frame 52 Time 4.6
O2S11 V 0.120
O2S12 V 0.640
Frame 53 Time 4.7
O2S11 V 0.125
O2S12 V 0.635
Frame 54 Time 4.7
O2S11 V 0.215
O2S12 V 0.635
Frame 55 Time 4.8
O2S11 V 0.605
O2S12 V 0.635
Frame 56 Time 4.9
O2S11 V 0.835
O2S12 V 0.635
Frame 57 Time 5.0
O2S11 V 0.890
O2S12 V 0.635
Frame 58 Time 5.1
O2S11 V 0.835
O2S12 V 0.635
Frame 59 Time 5.2
O2S11 V 0.775
O2S12 V 0.635
Frame 60 Time 5.3
O2S11 V 0.390
O2S12 V 0.635
Frame 61 Time 5.3
O2S11 V 0.150
O2S12 V 0.635
Frame 62 Time 5.4
O2S11 V 0.120
O2S12 V 0.635
Frame 63 Time 5.5
O2S11 V 0.115
O2S12 V 0.620
Frame 64 Time 5.6
O2S11 V 0.115
O2S12 V 0.605
Frame 65 Time 5.7
O2S11 V 0.125
O2S12 V 0.600
Frame 66 Time 5.8
O2S11 V 0.160
O2S12 V 0.605
Frame 67 Time 5.9
O2S11 V 0.470
O2S12 V 0.610
Frame 68 Time 5.9
O2S11 V 0.755
O2S12 V 0.615
Frame 69 Time 6.0
O2S11 V 0.875
O2S12 V 0.615
Frame 70 Time 6.1
O2S11 V 0.890
O2S12 V 0.615
Frame 71 Time 6.2
O2S11 V 0.885
O2S12 V 0.615
Frame 72 Time 6.3
O2S11 V 0.820
O2S12 V 0.625
Frame 73 Time 6.4
O2S11 V 0.485
O2S12 V 0.625
Frame 74 Time 6.5
O2S11 V 0.165
O2S12 V 0.630
Frame 75 Time 6.5
O2S11 V 0.120
O2S12 V 0.630
Frame 76 Time 6.6
O2S11 V 0.115
O2S12 V 0.630
Frame 77 Time 6.7
O2S11 V 0.125
O2S12 V 0.625
Frame 78 Time 6.8
O2S11 V 0.180
O2S12 V 0.625
Frame 79 Time 6.9
O2S11 V 0.510
O2S12 V 0.625
Frame 80 Time 7.0
O2S11 V 0.735
O2S12 V 0.625
Frame 81 Time 7.1
O2S11 V 0.800
O2S12 V 0.625
Frame 82 Time 7.1
O2S11 V 0.765
O2S12 V 0.625
Frame 83 Time 7.2
O2S11 V 0.680
O2S12 V 0.630
Frame 84 Time 7.3
O2S11 V 0.345
O2S12 V 0.635
Frame 85 Time 7.4
O2S11 V 0.155
O2S12 V 0.640
Frame 86 Time 7.5
O2S11 V 0.125
O2S12 V 0.640
Frame 87 Time 7.6
O2S11 V 0.120
O2S12 V 0.640
Frame 88 Time 7.7
O2S11 V 0.125
O2S12 V 0.635
Frame 89 Time 7.8
O2S11 V 0.210
O2S12 V 0.635
Frame 90 Time 7.8
O2S11 V 0.575
O2S12 V 0.635
Frame 91 Time 7.9
O2S11 V 0.775
O2S12 V 0.635
Frame 92 Time 8.0
O2S11 V 0.840
O2S12 V 0.635
Frame 93 Time 8.1
O2S11 V 0.805
O2S12 V 0.635
Frame 94 Time 8.2
O2S11 V 0.705
O2S12 V 0.650
Frame 95 Time 8.3
O2S11 V 0.375
O2S12 V 0.655
Frame 96 Time 8.4
O2S11 V 0.145
O2S12 V 0.660
Frame 97 Time 8.4
O2S11 V 0.120
O2S12 V 0.655
Frame 98 Time 8.5
O2S11 V 0.115
O2S12 V 0.640
Frame 99 Time 8.6
O2S11 V 0.130
O2S12 V 0.630
Frame 100 Time 8.7
O2S11 V 0.255
O2S12 V 0.630
Frame 101 Time 8.8
O2S11 V 0.635
O2S12 V 0.625
Frame 102 Time 8.9
O2S11 V 0.790
O2S12 V 0.620
Frame 103 Time 9.0
O2S11 V 0.800
O2S12 V 0.620
Frame 104 Time 9.0
O2S11 V 0.755
O2S12 V 0.620
Frame 105 Time 9.1
O2S11 V 0.470
O2S12 V 0.620
Frame 106 Time 9.2
O2S11 V 0.180
O2S12 V 0.625
Frame 107 Time 9.3
O2S11 V 0.125
O2S12 V 0.625
Frame 108 Time 9.4
O2S11 V 0.120
O2S12 V 0.620
Frame 109 Time 9.5
O2S11 V 0.130
O2S12 V 0.615
Frame 110 Time 9.6
O2S11 V 0.300
O2S12 V 0.610
Frame 111 Time 9.7
O2S11 V 0.625
O2S12 V 0.615
Frame 112 Time 9.7
O2S11 V 0.815
O2S12 V 0.610
Frame 113 Time 9.8
O2S11 V 0.845
O2S12 V 0.610
Frame 114 Time 9.9
O2S11 V 0.805
O2S12 V 0.630
Frame 115 Time 10.0
O2S11 V 0.765
O2S12 V 0.650
Frame 116 Time 10.1
O2S11 V 0.330
O2S12 V 0.655
Frame 117 Time 10.2
O2S11 V 0.150
O2S12 V 0.655
Frame 118 Time 10.3
O2S11 V 0.120
O2S12 V 0.650
Frame 119 Time 10.4
O2S11 V 0.115
O2S12 V 0.645
Frame 120 Time 10.4
O2S11 V 0.130
O2S12 V 0.630
Frame 121 Time 10.5
O2S11 V 0.155
O2S12 V 0.625
Frame 122 Time 10.6
O2S11 V 0.400
O2S12 V 0.620
Frame 123 Time 10.7
O2S11 V 0.720
O2S12 V 0.620
Frame 124 Time 10.8
O2S11 V 0.830
O2S12 V 0.620
Frame 125 Time 10.9
O2S11 V 0.860
O2S12 V 0.620
Frame 126 Time 11.0
O2S11 V 0.830
O2S12 V 0.660
Frame 127 Time 11.0
O2S11 V 0.755
O2S12 V 0.685
Frame 128 Time 11.1
O2S11 V 0.420
O2S12 V 0.685
Frame 129 Time 11.2
O2S11 V 0.145
O2S12 V 0.685
Frame 130 Time 11.3
O2S11 V 0.115
O2S12 V 0.675
Frame 131 Time 11.4
O2S11 V 0.115
O2S12 V 0.635
Frame 132 Time 11.5
O2S11 V 0.120
O2S12 V 0.620
Frame 133 Time 11.6
O2S11 V 0.145
O2S12 V 0.610
Frame 134 Time 11.7
O2S11 V 0.345
O2S12 V 0.605
Frame 135 Time 11.7
O2S11 V 0.625
O2S12 V 0.605
Frame 136 Time 11.8
O2S11 V 0.755
O2S12 V 0.605
Frame 137 Time 11.9
O2S11 V 0.800
O2S12 V 0.605
Frame 138 Time 12.0
O2S11 V 0.745
O2S12 V 0.605
Frame 139 Time 12.1
O2S11 V 0.485
O2S12 V 0.600
Frame 140 Time 12.2
O2S11 V 0.180
O2S12 V 0.600
Frame 141 Time 12.3
O2S11 V 0.125
O2S12 V 0.595
Frame 142 Time 12.4
O2S11 V 0.115
O2S12 V 0.590
Frame 143 Time 12.4
O2S11 V 0.115
O2S12 V 0.520
Frame 144 Time 12.5
O2S11 V 0.175
O2S12 V 0.490
Frame 145 Time 12.6
O2S11 V 0.455
O2S12 V 0.540
Frame 146 Time 12.7
O2S11 V 0.720
O2S12 V 0.550
Frame 147 Time 12.8
O2S11 V 0.830
O2S12 V 0.565
Frame 148 Time 12.9
O2S11 V 0.830
O2S12 V 0.560
Frame 149 Time 13.0
O2S11 V 0.790
O2S12 V 0.560
Frame 150 Time 13.0
O2S11 V 0.560
O2S12 V 0.565
Frame 151 Time 13.1
O2S11 V 0.190
O2S12 V 0.565
Frame 152 Time 13.2
O2S11 V 0.125
O2S12 V 0.570
Frame 153 Time 13.3
O2S11 V 0.115
O2S12 V 0.525
Frame 154 Time 13.4
O2S11 V 0.115
O2S12 V 0.450
Frame 155 Time 13.5
O2S11 V 0.125
O2S12 V 0.420
Frame 156 Time 13.6
O2S11 V 0.355
O2S12 V 0.460
Frame 157 Time 13.7
O2S11 V 0.755
O2S12 V 0.510
Frame 158 Time 13.7
O2S11 V 0.905
O2S12 V 0.520
Frame 159 Time 13.8
O2S11 V 0.910
O2S12 V 0.565
Frame 160 Time 13.9
O2S11 V 0.900
O2S12 V 0.635
Frame 161 Time 14.0
O2S11 V 0.865
O2S12 V 0.700
Frame 162 Time 14.1
O2S11 V 0.820
O2S12 V 0.710
Frame 163 Time 14.2
O2S11 V 0.700
O2S12 V 0.705
Frame 164 Time 14.3
O2S11 V 0.305
O2S12 V 0.700
Frame 165 Time 14.4
O2S11 V 0.140
O2S12 V 0.685
Frame 166 Time 14.4
O2S11 V 0.115
O2S12 V 0.660
Frame 167 Time 14.5
O2S11 V 0.115
O2S12 V 0.570
Frame 168 Time 14.6
O2S11 V 0.120
O2S12 V 0.545
Frame 169 Time 14.7
O2S11 V 0.135
O2S12 V 0.570
Frame 170 Time 14.8
O2S11 V 0.295
O2S12 V 0.595
Frame 171 Time 14.9
O2S11 V 0.565
O2S12 V 0.600
Frame 172 Time 15.0
O2S11 V 0.775
O2S12 V 0.595
Frame 173 Time 15.0
O2S11 V 0.840
O2S12 V 0.595
Frame 174 Time 15.1
O2S11 V 0.855
O2S12 V 0.600
Frame 175 Time 15.2
O2S11 V 0.820
O2S12 V 0.600
Frame 176 Time 15.3
O2S11 V 0.685
O2S12 V 0.600
Frame 177 Time 15.4
O2S11 V 0.255
O2S12 V 0.600
Frame 178 Time 15.5
O2S11 V 0.130
O2S12 V 0.595
Frame 179 Time 15.6
O2S11 V 0.115
O2S12 V 0.595
Frame 180 Time 15.7
O2S11 V 0.115
O2S12 V 0.570
Frame 181 Time 15.7
O2S11 V 0.115
O2S12 V 0.520
Frame 182 Time 15.8
O2S11 V 0.145
O2S12 V 0.525
Frame 183 Time 15.9
O2S11 V 0.430
O2S12 V 0.555
Frame 184 Time 16.0
O2S11 V 0.725
O2S12 V 0.560
Frame 185 Time 16.1
O2S11 V 0.815
O2S12 V 0.565
Frame 186 Time 16.2
O2S11 V 0.810
O2S12 V 0.560
Frame 187 Time 16.3
O2S11 V 0.755
O2S12 V 0.570
Frame 188 Time 16.4
O2S11 V 0.460
O2S12 V 0.570
Frame 189 Time 16.4
O2S11 V 0.145
O2S12 V 0.570
Frame 190 Time 16.5
O2S11 V 0.115
O2S12 V 0.565
Frame 191 Time 16.6
O2S11 V 0.115
O2S12 V 0.375
Frame 192 Time 16.7
O2S11 V 0.115
O2S12 V 0.240
Frame 193 Time 16.8
O2S11 V 0.130
O2S12 V 0.210
Frame 194 Time 16.9
O2S11 V 0.395
O2S12 V 0.340
Frame 195 Time 17.0
O2S11 V 0.790
O2S12 V 0.430
Frame 196 Time 17.1
O2S11 V 0.900
O2S12 V 0.500
Frame 197 Time 17.1
O2S11 V 0.910
O2S12 V 0.555
Frame 198 Time 17.2
O2S11 V 0.895
O2S12 V 0.605
Frame 199 Time 17.3
O2S11 V 0.865
O2S12 V 0.670
Frame 200 Time 17.4
O2S11 V 0.835
O2S12 V 0.700
Frame 201 Time 17.5
O2S11 V 0.785
O2S12 V 0.710
Frame 202 Time 17.6
O2S11 V 0.680
O2S12 V 0.705
Frame 203 Time 17.7
O2S11 V 0.265
O2S12 V 0.700
Frame 204 Time 17.7
O2S11 V 0.130
O2S12 V 0.690
Frame 205 Time 17.8
O2S11 V 0.115
O2S12 V 0.675
Frame 206 Time 17.9
O2S11 V 0.115
O2S12 V 0.625
Frame 207 Time 18.0
O2S11 V 0.115
O2S12 V 0.585
Frame 208 Time 18.1
O2S11 V 0.120
O2S12 V 0.605
Frame 209 Time 18.2
O2S11 V 0.235
O2S12 V 0.615
Frame 210 Time 18.3
O2S11 V 0.625
O2S12 V 0.620
Frame 211 Time 18.4
O2S11 V 0.820
O2S12 V 0.610
Frame 212 Time 18.4
O2S11 V 0.835
O2S12 V 0.610
Frame 213 Time 18.5
O2S11 V 0.800
O2S12 V 0.605
Frame 214 Time 18.6
O2S11 V 0.670
O2S12 V 0.610
Frame 215 Time 18.7
O2S11 V 0.370
O2S12 V 0.615
Frame 216 Time 18.8
O2S11 V 0.145
O2S12 V 0.610
Frame 217 Time 18.9
O2S11 V 0.115
O2S12 V 0.610
Frame 218 Time 19.0
O2S11 V 0.115
O2S12 V 0.545
Frame 219 Time 19.1
O2S11 V 0.120
O2S12 V 0.540
Frame 220 Time 19.1
O2S11 V 0.145
O2S12 V 0.570
Frame 221 Time 19.2
O2S11 V 0.455
O2S12 V 0.580
Frame 222 Time 19.3
O2S11 V 0.765
O2S12 V 0.580
Frame 223 Time 19.4
O2S11 V 0.865
O2S12 V 0.580
Frame 224 Time 19.5
O2S11 V 0.860
O2S12 V 0.600
Frame 225 Time 19.6
O2S11 V 0.785
O2S12 V 0.635
Frame 226 Time 19.7
O2S11 V 0.545
O2S12 V 0.660
Frame 227 Time 19.7
O2S11 V 0.205
O2S12 V 0.635
Frame 228 Time 19.8
O2S11 V 0.115
O2S12 V 0.530
Frame 229 Time 19.9
O2S11 V 0.125
O2S12 V 0.500
Frame 230 Time 20.0
O2S11 V 0.255
O2S12 V 0.555
Frame 231 Time 20.1
O2S11 V 0.670
O2S12 V 0.570
Frame 232 Time 20.2
O2S11 V 0.050
O2S12 V 0.955
Frame 1287 Time1350.8
O2S11 V 0.555
O2S12 V 0.390
Frame -9881 Time-1990.3
O2S11 V 1.065
O2S12 V 0.185
Frame -23375 Time-346.5
O2S11 V 0.635
O2S12 V 1.145
Frame 12135 Time-1676.0
O2S11 V 0.985
O2S12 V 1.185
Frame -23887 Time-2064.8
O2S11 V 0.740
O2S12 V 0.855
Frame -2244 Time 930.4
O2S11 V 0.545
O2S12 V 0.875
Frame -4231 Time-565.9
O2S11 V 0.160
O2S12 V 0.780
Frame 15835 Time3208.6
O2S11 V 1.225
O2S12 V 0.150
Frame -6863 Time-2108.7
O2S11 V 0.035
O2S12 V 1.165
Frame -20253 Time-1667.6
O2S11 V 0.035
O2S12 V 1.220
Frame -12325 Time-351.8
O2S11 V 0.930
O2S12 V 0.065
Frame -24638 Time-2548.9
O2S11 V 0.080
O2S12 V 0.080
Frame -19115 Time-2503.6
If your downstream 02 is bad, your car will not run right. This is becuase the sensor will not be sending the correct info to the computer to make changes. HOWEVER, if your cat is bad, the car should still run relatively fine. The reason for this, is becuase the computer is getting signals from the downstream o2 saying "WOW something is wrong" and correcting it. A bad cat will probably lower ur gas milage a bit too.
I have the same code right now, and when I scanned it, i got a printout of things...this link shows exactly what the print out said.
P0420 Print out from AutoZone after scanning my car
So for the hell of it I checked my sensors again. The rear was now bouncing around like the front 02 does! I'm confused as hell and I don't know if I should replace that sensor or not. It may have to go to the dealer just to have them check it out.
a cat is cheaper then an 02 sensor....so figure out what one you think it is most, and start there...i would personally start with the cat, because a faulty cat can cause the 02 sensor to do funny things.
seriously? Cat is cheaper? A GM one is over 500 bucks. Where did you find it cheaper? An o2 sensor from GM is $184. I can get a bosch one from autozone from autozone for 80 something. The cat you put on in your link I can't use because I'm on a stock exhaust. Using magnaflow's website I found a universal 2" cat but that's still over 200 bucks. I hate cars. I'm buying a horse.
Ah ok then. well mine was under 80 bucks shipped for the Magnaflow 2.25 that i bought...my bad...
but on that note, somethign weird jsut happened....I got in my car, turning it on NO CODE....turned it off and back on...still no code...HMMM...nothign has been replaced yet, and i DID NOT clear the cod the night i had it scanned
