How do I fix P0171 system Too Lean bank 1?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
How do I fix my Toyota P0171 code?
Troubleshooting P0171 Code
- Most of the time, the best way to respond to a P017 is to try cleaning the MAF sensor and the lines running to and from it.
- When you clean the MAF sensor, be sure to inspect all of the lines including the vacuum and PCV hoses.
Which side is bank 1 on 4runner?
bank one is on the passenger side.
What does the code p0171 mean on a Toyota 4Runner?
4Runner P0171 Code Defined. P0171 is an OBDII trouble code. The code technically stands for: Fuel Trim System Lean Bank 1. The code is thrown when the oxygen sensors detect that there’s not enough oxygen in the exhaust system. This is commonly referred to as a “lean” condition.
How to fix code p0171 Toyota lean Bank 1?
How do I fix code P0171 TOYOTA? Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
What does p0171 stand for in V-6 engine?
This is one of the most common trouble codes in V-6 and larger engines. P0171 is a “System Too Lean (Bank 1),” which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the “Bank 1” side of the engine (designated as whichever side has cylinder number one).
What does p0171 mean on a bank 2 sensor?
Quite often P0171 is triggered in tandem with P0174, which comes on when the Bank 2 sensor detects too much oxygen in the exhaust. Oftentimes, a P0171 means that your Toyota is having trouble with a dirty or faulty mass air flow (MAF) sensor, or a vacuum leak downstream of the MAF sensor (perhaps in the PCV line or in the valve itself).