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2000 Mazda Protege P0171/P0771/P0741 Fault Diagnosis and DIY Fix Guide

Model: Mazda Protege Fault Code: P0171 Posted: 2006-12-20 16:31

Hello, I own a 2000 Mazda Protege 1.6L automatic model. About two weeks ago, my check engine light came on and the overdrive (O/D) indicator started flashing intermittently. I took it to a local mechanic who scanned the vehicle and found three diagnostic trouble codes: P0171, P0771, and P0741. The mechanic mentioned that repairing all issues could cost several thousand dollars, so I'm looking for ways to address most of these problems myself. Has anyone else experienced similar symptoms or encountered these specific codes on a 2000 Mazda Protege? I've already tried changing the transmission fluid, cleaning the MAF sensor, and inspecting the spark plugs — but I'm still unsure what steps to take next. Any advice on how to diagnose or fix these issues would be greatly appreciated. Thanks!

Related fault codes
P0171P0741P0771
Comments (5)
Anonymous 2006-12-20 16:35

Fuel pressure regulator failure is a common cause of P0171 and related codes. Vacuum leaks from intake gaskets or hoses can also contribute to this issue — check for loose or cracked vacuum lines and inspect the intake manifold seals.

Anonymous 2006-12-20 16:37

Thanks! I'll check the fuel pressure regulator and vacuum lines as suggested.

Anonymous 2006-12-20 16:38

what about the transmission codes? can i check the tranny some how?

Anonymous 2006-12-21 08:38

Recommended resource: https://www.alldata.com — provides detailed repair procedures for Mazda Protege models, including code-specific troubleshooting.

Anonymous 2007-01-05 17:26

Hello! I'm currently experiencing the same issue with my 2000 Mazda Protege 1.6L. The check engine light is on and the O/D light flashes intermittently. Symptoms include difficulty shifting into drive or reverse when moving from park, and sudden jerking while driving — especially when losing overdrive. When I disconnect the battery, the issues clear temporarily, but return once the engine warms up. I'm stationed in Portugal with the U.S. Army, where automatic vehicles are rare. Any suggestions for a long-term fix? This is becoming increasingly difficult to manage. Thanks, Todd