2003 Mazda MPV Q&A
2003 Mazda MPV Question: p0174
P0174 indicatres that cylinder bank 2 (the bank with cylinder #2) is running lean (not enough fuel). The computer thinks this because it oxygen (O2) sensor sees that the exhaust stream contains more oxygen that than expected by the computer program. It's possible that you have an exhaust leak upstream of the O2 sensor causing air to get in and cause a false "lean" reading. It's possible that one or more of the injectors are not working properly or there could be an airleak into the intake on the bank 2 side, either of these two conditions would probably cause an increase in hydrocarbon emissions which could be a clue. If you want a Mazda specialist, here's a directory link for you: https://repairpal.com/directory?address=44622&car_brand_names=Mazda - Superbob
...problems to repair? p0106 map/barometric pressure circuit high input p0171 system too lean p0174 system too lean p0300 random multiple cylinder misfire detected in addition the OBD cataly...
The guy at the Advance Auto part store said it could be the (oxygen sensor)