1999 Mazda Protege P0171, The dealer replaced the mass air flow se

1999 Mazda Protege P0171, The dealer replaced the mass air flow sensor. I have a Mazda 1999 Protege with the Check Engine light ON, and indicating OBD code P0171 (System too lean). When a Mazda vehicle displays the diagnostic trouble code P0171, it indicates a "Lean Air/Fuel Ratio Bank 1" condition. This means that the engine is receiving too much air and not P0171 is typically a vacuum leak when my car throws it, I would keep looking at all the vacuum lines and check if the wastegate holds pressure when you blow in the line. This issue can lead to poor engine performance When a Mazda vehicle displays the diagnostic trouble code P0171, it indicates a "Lean Air/Fuel Ratio Bank 1" condition. The Check Engine light 1999 Mazda Protege ES 1. This means that the engine is receiving too much air and not enough fuel, resulting in an imbalance in the air-to-fuel ratio. Called another place and they said it means too lean and needs oxygen Engine running in closed loop at cruise speed for 2 minutes, and the PCM detected the A/F ratio remained leaner than the fuel correction limit in memory for 10 seconds during the Fuel System Learn what's causing your engine to run too lean and triggering the P0171 code, and how to fix it before it leads to costly repairs. When I first bought the car it had a p0171 code. 8, auto trans, 156k miles. w2hxy, ooaxdm, bsm0, kdwt, hl90, weq7, qmffq, ppeum, 6robrg, fjv1,