O2s gone bad?
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Joined: Jun 2013
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From: blaine wa
O2s gone bad?
I got a 2000 corvette which is giving me these codes:P1133 P1153 P1431
The car runs rich otherwise its fine. I always have black soot on the tips after about 20 miles. It just gives me the CEL which is irratating. I did a bit of searching and it seems to have something to do with the O2 sensors? Would it be best to change them? I dont know if they have ever been changed. Any help is appreciated!
The car runs rich otherwise its fine. I always have black soot on the tips after about 20 miles. It just gives me the CEL which is irratating. I did a bit of searching and it seems to have something to do with the O2 sensors? Would it be best to change them? I dont know if they have ever been changed. Any help is appreciated!
Racer
Joined: Apr 2013
Posts: 305
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From: york south carolina
I have seen this error years ago on another corvette. The o2 sensor was slow in switching as the years go by. When the new sensor was replaced i saw on the scope the switching rate was 10x more then the old one. There easy to change if u can get to them and great insurance in keeping your car running tip top
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
There are a number of things that can cause 02 sensors to malfunction other than wear and tear.
You need to insure that you have proper heater voltage on the OXY/SEN fuse in the eng compartment fuse box. Measure the test points on the fuse to ground with the IGNITION ON. Make sure that you have FULL battery voltage at the fuse. If the O2 Sensor Heaters are not working at full potential, the sensor will fall prematurely.
Disconnect the sensor and read the GROUND wire to a good chassis ground. You should see little or no resistance.
Check all that before you replace the sensors or you could be damaging your new sensors.
BC
You need to insure that you have proper heater voltage on the OXY/SEN fuse in the eng compartment fuse box. Measure the test points on the fuse to ground with the IGNITION ON. Make sure that you have FULL battery voltage at the fuse. If the O2 Sensor Heaters are not working at full potential, the sensor will fall prematurely.
Disconnect the sensor and read the GROUND wire to a good chassis ground. You should see little or no resistance.
Check all that before you replace the sensors or you could be damaging your new sensors.
BC
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From: blaine wa
Melting Slicks
Joined: Jan 2009
Posts: 3,181
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From: Puyallup Washington
It can be many things other than the O2 sensor. On my 1992 the O2 sensor code was caused by the ECM not putting out the correct reference voltage to the sensor. On my 2002 the O2 code was caused by a small pinhole in the catalytic converter letting air into the exhaust and causing the rear sensor to see a lean condition.
Get out the factory service manual and actually figure out what is wrong instead of just replacing parts. It is much cheaper and quicker.
Get out the factory service manual and actually figure out what is wrong instead of just replacing parts. It is much cheaper and quicker.
Melting Slicks
Joined: Feb 2001
Posts: 2,803
Likes: 357
From: Northville, MI
If the O2's are original and you live in a state which has had E10 gas for many years, it could be the O2's are bad. Had a friend, who was former GM engineer on the C5 PCM build, with a 99 and less than 20000 miles have a similar problem 1 1/2 yrs ago. He checked with friends at engineering and they told him the new Delphi O2's are made for E10 fuel and do not degrade as fast as the originals and they also were made to switch at a faster rate.
Melting Slicks
Joined: Apr 2009
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Having recently changed out my forward O2 sensors, I can attest to the fact that they become slow and lazy and usually suffer a slow degrading death. Personally, I think O2 sensors should be changed as part of preventive maintenance, same as spark plugs. I was amazed and the improvement in throttle response and power with the new O2 sensors. Furthermore, I read that the new AC Delco sensors have been improved and have a faster response time. That alone, and the relatively low cost, should be enough reason to change them. If it doesn't solve your problem, at least you have new and improved sensors.
Instructor
Joined: Feb 2011
Posts: 140
Likes: 24
From: Houston Texas
I got a 2000 corvette which is giving me these codes:P1133 P1153 P1431
The car runs rich otherwise its fine. I always have black soot on the tips after about 20 miles. It just gives me the CEL which is irratating. I did a bit of searching and it seems to have something to do with the O2 sensors? Would it be best to change them? I dont know if they have ever been changed. Any help is appreciated!
The car runs rich otherwise its fine. I always have black soot on the tips after about 20 miles. It just gives me the CEL which is irratating. I did a bit of searching and it seems to have something to do with the O2 sensors? Would it be best to change them? I dont know if they have ever been changed. Any help is appreciated!
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From: blaine wa
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Joined: Jun 2013
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From: blaine wa
Melting Slicks
Joined: Jul 2012
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Having recently changed out my forward O2 sensors, I can attest to the fact that they become slow and lazy and usually suffer a slow degrading death. Personally, I think O2 sensors should be changed as part of preventive maintenance, same as spark plugs. I was amazed and the improvement in throttle response and power with the new O2 sensors. Furthermore, I read that the new AC Delco sensors have been improved and have a faster response time. That alone, and the relatively low cost, should be enough reason to change them. If it doesn't solve your problem, at least you have new and improved sensors.
The front ones are the ones that take most of the beating, the ones after the cat's have a much easier life.On some vehicles (like Fords) you have to reset the PCM (by disconnecting the battery) to reset the base fuel trims or it will use the last learned ones for quite a while.
Instructor
Joined: Feb 2011
Posts: 140
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From: Houston Texas
Finally figured out what the problem is. I had a cracked/deteriorating air injection line on my passenger side header. The incoming un-metered air was screwing the O2 sensors up big time. Its only by chance I discovered it a few nights ago. One would think an exhaust leak would have been more noticeable but I never thought to look at that tube. I suppose the black fiberglass or nylon "sock" over that tube was keeping just enough air out and exhaust in that it made it hard to detect. I figure it got broken when I had the headers installed and it got covered up. Not surprising considering on the way home something popped off my headers the very day I had them installed.
Anyhow....its worth a check. Squeeze the tube (when its cool) with your fingers and see if it feels mushy or you hear cracking sounds. I would also recheck/retighten all the connectors at the cats on back to the engine just to make sure everything is tight.
Anyhow....its worth a check. Squeeze the tube (when its cool) with your fingers and see if it feels mushy or you hear cracking sounds. I would also recheck/retighten all the connectors at the cats on back to the engine just to make sure everything is tight.