2000 Toyota Tundra Code P0171

The brake booster is vacuum assisted and works off of engine vacuum.

2000 toyota tundra code p0171. Tundra P0171 Code Defined. My 2000 has the same code for the last 6 months. While watching the fuel trims on your scanner engine fully warmed up step on the brake pedal.

Fuel Trim System Lean Bank 1. If the problem persists the front oxygen O2 sensor may need to be replaced. 2 trip detection logic Trouble Area.

Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 147 parts air to 1 part fuel. END OF SPECIAL NOTES. Toyota Code P0171 Definition.

So your cars CEL always check Engine Light is on and also you had the codes scanned at a local parts shop. Gas leakage on exhaust system. The P0174P0171 codes Fuel system too lean banks 1 and 2 usually means a vacuum leak from the intake manifold gasket a vacuum hose PCV hose etc or the MAF is dirty or theres a fuel delivery problem clogged injectors fuel pump going out etc.

Open the hood and locate the mass air flow sensor. If there are no intake leaks the next step is to replace the air filter and clean the airflow meter. If it is a 34 or a 30 the six cyl will have a left bank and a right bank for each head of the engine and each bank should have its own o2 sensor before and after the cat especially if it is the system that has two cats one for each bank Hints the error code p0171 system to.

Having had a 01 Taco before this Im really familiar with the MAF sensor codes. Hope this information helps. 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.