2002 Mazda Protege 2.0

05-07-2009, 12:33 PM
hi, i have a car that suddenly the engine light came on....code is p0171 (system too lean (bank 1) what does this mean.... and what do i have to do to get it fixed..?????

05-12-2009, 05:38 AM
It's difficult to say exactly how to solve the problem. Some diagnostic work is required to find the specific item needing service or repair.
Here are some links that may help.


Doug Tatham
06-17-2009, 02:29 PM
Almost every time I've run across a P0171 error it's been because of a vacuum leak. A typical cause is a dry rotted hose. One time I had the error because of the connector between the hose to the pcv valve and the intake boot. Another time was because of the intake boot (tube, whatever). I fixed a friends truck and it was caused by a vacuum hose that went from one valve cover to the pcv valve. Other possibilities usually give additional error codes.

06-17-2009, 03:30 PM
Just had mine come on after I changed my gas cap to an aftermarket, didn't seal tight and had check engine show up...not sure what the code was but just throwing it out there.

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