986 Battery Group

[thom4782]

Question: I thought P0410 and P1411 meant implausible signals from the bank 1 and bank 2 oxygen sensors. Once the car starts, doesn't the alternator provide sufficient voltage for the O2 sensors to do their jobs. And if the sensors are doing their jobs, why the CEL? In my car, it was a vacuum leak that triggered the light each time the SAI system was ready to test and the SAI pump turned off.

[mikefocke]

The 2 codes and their diagnosis are covered here. Even a flow chart, systems visual etc.

Yes, it is usually a leak, mine was but since I started out thinking MAF, I had to go down the how do you detect, diagnose etc trail.

O2 sensor failures are usually quite specific and indicated by other codes.

[Jaak]

If the reference voltage is low due to a "poor" battery, it will still throw codes. It takes a while for the alternator to start putting out a higher voltage due to the battery issue with the SAI working for about the first 40 seconds on start-up. IIRC it takes a number of "faults" before it throws a code. If the voltages are low the references will be off.

I also remember other codes for the alarm system being there as well. They are also gone and now the "red clip" works.

[Jaak]

Bump for those looking for a battery.


Mine is in storage for the winter and when I checked it last week, it was still at 89% capacity, same as when I put it in. I need to charge it up full when I have more time there (off site, friends storage site). I did disconnect the battery.

[PazzaDonna8]

I have a 2002 Boxter S that I need to replace the battery. I have researched several places and the MAXX-94R continues to come up. However, I cannot seem to find it. Did the model number change or is Wal-Mart no longer carrying this specific model?

-Lorin