Can a map sensor cause a P0171 code?
Low manifold vacuum can cause a P0171 code and a P0174 code Sensor issues—If the MAF or MAP sensors aren’t working properly or the oxygen sensors are worn or contaminated, the computer will miscalculate the air/fuel mixture.
Can a bad map sensor cause a lean code?
Your engine pings: In some cases, a failed MAP sensor can cause the engine to run lean or the spark plugs to fire sooner than they should. This will result in detonation, which creates a pinging sound from the engine when you accelerate.
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.
What is the trouble code on my Toyota 4Runner?
One of the most common trouble codes with the Toyota 4Runner is the P0171 code. This code number references a number that is given to you when you plug your car into a OBDII scanner. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common.
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).
What to do if your check engine light code is p0171?
Reconnect any disconnected vacuum lines and replace any damaged vacuum lines that are leaking, then use FIXD to clear check engine light code P0171. If check engine light code P0171 is triggered again, check the rest of the vacuum lines for leaks and continue to the rest of the diagnostic process.