360 P0132 CEL Question

I installed Fabspeed sport headers on my 360 and am now getting a CEL with the P0132 code. This is for the O2 sensor bank 1 sensor 1 high voltage. I was getting it on both banks and I have made some adapters to pull the O2 sensors after the cats further out of the stream and it cleared up bank two. My question is does a high voltage mean it needs to be a little further out of the stream or does high voltage mean I am not seeing enough unspent fuel so I need to put it a little farther back into the exhaust? I think I am right on the cusp and just need to know which way to go with the adapter on the one side.

 

Hmmmmmm, you're not going to like my answer.

An O2 sensor reacts to the A/F ratio, not the heat. The original sensor and all sensors I'm aware of have a negative coefficient to A/F ratio. So, a high voltage would indicate that you have a rich or high fuel to air ratio(a low air to fuel ratio). Using your vernacular, you have unburnt or partially burnt fuel in the exhaust stream, which would indicate that you should move the sensor backward, if and only if the products of combustion have excess air/O2 to use in burning the fuel left over in the exhaust. If you have a rich mixture and there is no air left to burn the remnant fuel, nothing you do to relocate can fix the problem.

Did you disconnect the battery for at least 30 minutes so that the ECUs will go into learn mode? Did you change O2 sensor vendors, or use the original sensor? Did you clear the codes before taking measurements? Can you get the actual voltage off the O2 sensor?

 

What your saying is exactly what I was thinking. Pulling it a little farther out of the stream should allow it to see less on average. I did kill the battery, reset everything and I am using the original O2 sensors since everything was fine before I changed them. I tried to check the values but for some reason my ODBII only shows bank 1 sensors so I don't know what it is reading.

Bank 1 is the passenger side, isn't it?

 

Just ref your OBD2 and Bank 1 - my scan tool always hooks up to one ECU at a time and when I hook up first time it never gives me an option to choose which one - it just connects. In order to connect to the second ECU I have to tell it to disconnect and then reconnect. When it reconnects it then asks me do I want ECU 11 or 14 (from memory).

Just thought this might be of some help. (Ignore if not!)

Best of luck, I know nothing of 02 sensor issues!

 

Thanks Greg. I'll try that but I have never gotten an option for the second bank. It just reconnects.

 

bank one sensor one is the upstream 02 sensor. only the down stream sensors are pulled out of the air stream if you futz with the cats like deleteing them. You have an issue with the bank1 upstream sensor. Check wiring first, swap bank 1 sensors left right to look for a cel move etc. This has nothing to do with your downstream 02 sensor movement out of the stream.

 

I developed a ln recurring P0132 code in my 360 a year ago. Tried swapping the bank 1 sensor 1 from right to left but the code still remained. As my sensors were brand new, it was highly unlikely to be my sensors. Also serviced my injectors and changed the ignition coils and spark plugs. In the end, I found out that it was due to a cracked connector to the bank 1 exhaust heat sensor resulting in a substantial exhaust leak. Since sorting the leak out by tying down the exhaust sensor with metal ties and sealing the gap with exhaust gasket, the code has not appeared again. Fingers crossed. So my advice is check your whole exhaust system for leaks as it may be the easiest fix for a p0132 code. Hope that helps
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