I cannot figure this out

DOOMMONKEY777

Well i have had this issue for some time my self and i finally figured it out,

what has happened to me is that my O2 sensor on Bank2 gives High voltage on cold start 2.59v is hella high, compared that its suposto give 0.1-0.9v or so during its normal operation, witch triggers more fuel adjustments to bank 2, now its not hitting 14.7:1 but more like 11s:1 ratio on one bank.

now this does not stay like that for too long about 6 min until the sensor reaches to some temp point and goes to its normal operating voltage, this made it hard to catch since i warm the car up every cold start.

only one time the code P0158 popped recently when i was running late for work and didnt warm my car up, which caused me to record my perimeters to see wft is going on on cold starts.

GL OP i hope this helps.

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