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Ok, got out my handy Bosch Fuel Injection and Engine Management book (everyone has of these, right?) and the ECU will also slightly alter the ignition timing based on battery voltage. The logic is that lower battery voltage will not charge the coil packs as quickly. The goal is to maintain constant current in the coil packs so as not to overheat them.
With all of this being said, P1126 is oxygen sensing adaptation range 1 (cyls. 4-6) at enrichment limit. I doubt that this code is the result of a bad battery alone, so its probably two separate problems. But go the easy route and replace the battery and see if that fixes the problem. These integrated engine management systems can create somewhat strange symptoms based on simple problems. If not, then proceed to look for a vacuum leak, bad MAF, etc.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 04-28-2013 at 07:25 AM.
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So that is fixed! I had my old one load tested and it was not taking a charge... and you are correct as far as that not having anything to do with the 1126 code...
Hybrid Mode
