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- Mazda MPV (https://www.mazdaforum.com/forum/mazda-mpv-17/)

- - Bank 1 Malfunction (https://www.mazdaforum.com/forum/mazda-mpv-17/bank-1-malfunction-17069/)

ernestoqjr

01-07-2009 02:54 AM

Bank 1 Malfunction

i have a code P0170....FUEL TRIM MALFUNCTION (BANK 1) can anyone explain this code.....need to pass the smog check :eek:

hixx	01-07-2009 07:58 AM

RE: Bank 1 Malfunction

The o2 sensors constantly switch the fuel mixture from rich to lean above 2400 rpm to achieve 19.7 to 1 air/fuel ratio. If an o2 sensor is lazy and slow to switch it can kick this code as well as a vacuum leak/dirty injector etc.

ernestoqjr

01-09-2009 07:11 AM

RE: Bank 1 Malfunction

thanks Hixx...:)..... i will check all the lines and change my O2 sensors......van is 11 years old I guess its about time to replace the O2 sensors.....can I use a universal type sensors :eek:?

hixx	01-09-2009 02:09 PM

RE: Bank 1 Malfunction

Yes the aftermarket sensors are fine.

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