Question 1

What are P0172 and P0175 codes?

Accepted Answer

P0172 means system too rich bank 1. P0175 means system too rich bank 2.

Question 2

What Does P0172 and P0175 Mean?

Accepted Answer

P0172 and P0175 are generic trouble codes that set when the engine�s air/fuel mixture becomes too rich for the Engine Control Module (ECM) to correct within its set operating range. A Rich mixture is a mixture that has too much fuel or not enough oxygen. The ECM sets a target air/fuel ratio and monitors it using oxygen sensors and on newer vehicles air/fuel ratio sensors. When the ECM sees the engine running rich, it will command the fuel injectors to provide less fuel and monitor the change. If the fuel reduction goes past the ECMs predetermined range, the ECM will set a rich DTC P0172, P0175, or both.

Question 3

What Causes P0171 and P0174 to Set?

Accepted Answer

Malfunctioning oxygen (O2) or air fuel ratio (A/F) sensor, incorrect air metering, faulty Mass Air Flow (MAF) sensor, inaccurate temperature (temp) sensor signals, or faulty fuel injectors or fuel pressure regulator

Question 4

How to diagnose P0172 and P0175 DTCs?

Accepted Answer

Check oxygen sensors and/or air fuel ratio sensors, check Mass Air Flow sensor, test temperature sensors for accuracy, check fuel injectors and fuel pressure regulator, or inspect or replace engine oil

Question 5

How do I repair a P0172 or P0175 DTC?

Accepted Answer

Execute the appropriate diagnostic checks and repair the appropriate faulty parts. Due to the number of potential issues guessing could be costly. If you need assistance please call the GoTech team.