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shop installed new pre-cat (B1S1, B2S1) O2 sensors. 2 extented test drives and sitting in their lot idling for 2 hours, runs fine. i get it back and drive it 20 minutes to work, idles like crap again.
if was heater related, it would give heater faults. and after the engine and exhaust is warmed up, the O2 heaters are out of the picture.
but all we're getting is fuel trim faults.
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dave
2001 Porsche Boxster S
1988 Porsche 928 S4
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