CEL and codes

[Overdrive]

Thanks, Johnny. So using that listing from Randall, here's what the codes I pulled note:

P1117 Oxygen Sensor Heating 1 After Catalytic Converter - Below Lower Limit

P1121 Oxygen Sensor Heating 2 After Catalytic Converter - Below Lower Limit

P1124 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Rich Threshold

P0140 Oxygen Sensor After Catalytic Converter (cylinders 1 - 3) - Interruption of Signal

So if I'm understanding this right, it all seems to be on the 1-3 side of the engine. That "Rich Threshold " code has me wondering, though. Is it reading rich because the other side is reading lean? Either way, aside from checking that the connection isn't just loose on one of the sensors, what could I be looking at here?

[Jager]

What is the history of your AOS? Have you opened the oil fill cap while the car is running recently? After you remove the oil fill cap does the engine idle go up or down?

You could try swapping O2 sensors, left with right side, and clear the codes. This will provide some information.

[Overdrive]

Jager, the best answer I can give you regarding the AOS history is unknown. It has not been replaced in my year of ownership, and I wouldn't be surprised if it's the original unit on the car. Prior to my purchase, it was crashed, bought at auction as a repairable collision, repaired, driven as the personal car for about 4 years of the owner of the shop that fixed it, and then sat on his shop's lot for about 5 years until I bought it. From 97-05 the car had managed to accumulate 40k in mileage.

Here's the car's history since I've had it:
- Ignition Switch replaced (June 2010)
- Michelin PilotSport A/S Plus set put on last year (Fall 2010)
- Alternator and belt replaced (June 2011)
- Battery replaced (June 2011)
- IMSR and RMS (June 2011)
- Oil change (June 2011)
- Robbins glass window top (July 2011)
- Air filter and MAF replaced (July 2011)

Other than that I am simply assuming that everything else on the car that has gone untouched is original. The car was as stock as could be and now only isn't because of the new top, so it wouldn't surprise me if the majority of parts in that car are from 1997.

[Topless]

Clear the codes and see if they come back. I had a similar issue with oddball error codes after replacing my battery. When voltage to the DME went to zero it caused a hickup . I cleared them and they did not return.

Since your car was damaged in an accident it may also be a damaged sensor harness or DME harness. You can trace the wires and see if there are any chaff points or loose connectors.

[Overdrive]

I am wondering if maybe the throttle position codes have to do with the car relearning after the battery got disconnected, but it's had a good few hundred miles put on it since then, and about 90 miles since the MAF replacement and clearing of the codes at that time.

If I swap banks with the O2 sensors, should I clear the codes or simply scan and see if the error switches sides? Just want to know if I should set time aside for another near 100 mile drive to bring the codes back up.

[Jager]

You will have to clear the codes after swapping the O2 sensors, then see what happens after a few miles.

[Overdrive]

Ok, time for a bit of an update.

Haven't done any 02 bank swapping, but did use the code reader again to reset the light and see if it comes back. This time I'm reading 8 codes, some being repeats from before, but here they are:


P1117 Oxygen Sensor Heating 1 After Catalytic Converter - Below Lower Limit

P1121 Oxygen Sensor Heating 2 After Catalytic Converter - Below Lower Limit

P1124 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Rich Threshold

P0140 Oxygen Sensor After Catalytic Converter (cylinders 1 - 3) - Interruption of Signal

P0410 Secondary Air Injection System - Signal Implausible (Cylinders 1-3)

P1126 Oxygen Sensing Adaptation Area 1 (Cylinders 4-6) - Rich Threshold

P1411 Secondary Air Injection System - Signal Implausible (Cylinders 4-6)

P0160 Oxygen Sensor After Catalytic Converter (Cylinders 4-6) - Interruption of Signal