P0172 - SYSTEM TOO RICH (BANK 1)
Description of DTC code P0172
The diagnostic code P0172 OBDII means that an O2 oxygen sensor in bank 1 found that there is not enough oxygen in the exhaust. Remember that in 6, 8- and 10-cylinder engines, bank 1 belongs to the part of the engine that has cylinder #1.
This DTC Code is very similar to code P0175, and your car may indicate both codes at the same time.
Symptoms of fault code P0172
- It is likely that there is no problem when driving the vehicle.
- During engine start there are faults.
Causes of OBD2 P0172
- It is likely that the MAF sensor is defective or dirty.
- Maybe the filter is dirty or have oil.
- There may be a vacuum leak.
- There are difficulties in fuel pressure.
- Fuel Pump Check Valve Failures.
- The PCV valve indicates a fault or a leak.
- EGR valve
- A flue gas leak is located before the lambda sensor.
- Leaks from The Evaporative Emission Control System
Possible solutions of the DTC code P0172
- Purify the MAF sensor and remember that it must be dry in order to install it, otherwise it could be damaged.
- Check the PCV valve and all vacuum hoses, and if there is any failure in these components, replace it.
- Check the fuel pressure.
- Verify the fuel pump.
- Fuel injectors should be cleaned if dirty.
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