Question about Mazda Cars & Trucks
My mazda MPV 2004 just failed emissions due to 2 codes 0171 and 0174, what needs to be fixed/
Well it depends on what the problem is.
The two codes are for the fuel system being too lean on both banks. You have an O2 sensor on each bank that sends data to the computer telling it if the fuel mixture is too rich or too lean. The computer adjusts the on time for the injectors based on that and other data.
The most common reason you would get those two codes at the same time is low fuel pressure. So the fuel pressure would need to be checked along with the O2 sensors.
Posted on May 02, 2013
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Posted on Jan 02, 2017
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