PO100 and MAF Sensor Fault on 1997 Nissan Pickup - Choking at 45 mph?
HELP!!! I'm not convinced by Jiffy Lube or AAMCO when they said my check engine light shows PO100 and MAF DrVAF (Mass Airflow Sensor fault). What exactly does that mean? I have a 1997 Nissan Pickup, and at around 45 mph it starts to choke — I have to constantly adjust the accelerator pedal. The vehicle doesn't overheat, but the engine performance drops dramatically, especially when entering highways. Anyone else experienced this? What should I do next with this fault code?
Your choice of shops to diagnose your 'check engine light' is likely incorrect. The PO100 and MAF sensor fault codes are well-documented in 1997 Nissan Pickup service manuals — the issue often points to a faulty mass airflow sensor or a vacuum leak. Check for loose hoses or dirty air intake components. Forums suggest cleaning or replacing the MAF sensor as a first step before further diagnostics.