2001 MITSUBISHI MONTERO
64,500 MILES
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I have 2001 mitsubishi montero xls with 64500 miles, service engine soon light is on. Ckeck in autozone appear codes P0173- P0170 change mass air flow sensor, bank 1 and bank 2 sensor light still on. what can I do to resolve this problem. Thans.
Dec 9, 2012 at 2:05 AM
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KHLOW2008
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Probable Causes

l VAF sensor failed.
l Incorrect fuel pressure.
l Air intake system leak.
l Heated Oxygen Sensor (HO2S) failed.
l Engine Coolant Temperature (ECT) sensor failed.
l Intake Air Temperature (IAT) sensor failed.
l Barometric Pressure (BARO) sensor failed.
l Exhaust system leak.
l Incorrect or contaminated fuel used.
l Powertrain Control Module (PCM) failed.

You don't start replacing components wthout any diagnostics and fuel trim faults involves many components. If you have a scan tool to monitor the vasious components ikely to cause the problem, you might be able to see which is not functioning correctly.

It could even be caused by a clogged air filter.
Dec 9, 2012 at 8:41 AM