2000 Toyota Tundra Code P0171

Tech prelaced ECU and AF sensor.

2000 toyota tundra code p0171. Looking at my short and long term fuel trim percentages they correlate away from a vacuum leak. Hope this information helps. While watching the fuel trims on your scanner engine fully warmed up step on the brake pedal.

Having had a 01 Taco before this Im really familiar with the MAF sensor codes. So your cars CEL always check Engine Light is on and also you had the codes scanned at a local parts shop. Joined Nov 18 2011 1 Posts.

STFT 08 LTFT 555 BANK 2. I always just use CRC Mass Airflow sensor cleaner just make sure you dont touch the wires. 2000 Toyota Tundra 34 P0171.

Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 147 parts air to 1 part fuel. Gas leakage on exhaust system. The OBDII trouble code P0171 - System Too Lean Bank 1 means that the engine air-fuel mixture is too lean or there is too much air and too little fuel.

Oftentimes a P0171 means that your Toyota is having trouble with a dirty or faulty mass airflow MAF sensor or a vacuum leak downstream of the MAF sensor perhaps in the PCV line or in the valve itself. Tech tested AF sensor on scan tool and sensor is not responding to lean command. Bank 1 sensor 2 have the same amplitude.

Discussion Starter 1 Mar 12 2012. END OF SPECIAL NOTES. If the problem persists the front oxygen O2 sensor may need to be replaced.