2000 Toyota Tundra Code P0171

Tech tested AF sensor on scan tool and sensor is not responding to lean command.

2000 toyota tundra code p0171. Discussion Starter 1 Mar 12 2012. Tech prelaced ECU and AF sensor. If there are no intake leaks the next step is to replace the air filter and clean the airflow meter.

If the problem persists the front oxygen O2 sensor may need to be replaced. P0171 TOYOTA code tech notes If the P0171 is combined with the P0174 code its very likely that the problem is caused by an intake leak. Code P0171 system too lean code P1135 AF Sensor heater circuit malfunction bank 1 sensor 1.

When there are more than 147 parts air to 1 part fuel in the air-fuel mixture a lean condition exists and code P0171 is triggered. They had in hand fuel fouled spark plugs and no explanation as to why. CEL OFF WITH P0171 174 CODES RPM.

Just read through your forum and sympathize with your P0171. While watching the fuel trims on your scanner engine fully warmed up step on the brake pedal. CEL ON WITH P0171174 CODES RPM.

P0171 is a lean code. Therefore this guide will briefly discuss the nature and causes of code P0171 as it relates to V-type Toyota engines. The following is freeze frame data from the code.

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. Code p0171 2000 toyota 4Runner with a 34L - Answered by a verified Toyota Mechanic. So your cars CEL always check Engine Light is on and also you had the codes scanned at a local parts shop.