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Been chasing after this code for a year already... P9E0/P9E1 (fuel mixture codes 1&2)... sometimes accompanied by 0174 codes. Only happens during cruising speed (60-70MPH, constant throttle at 2K rpm).
These codes started happening after replacing injectors and spark plugs. Since then I replaced the pre-cat O2 sensors, got rid of the O2 sims, and stepped away from E85 and only on 93 octane. Im confused.
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