DTC P0172:00, P0175:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P0172:00 DTC P0175:00	P0172:00: System too rich (RH) P0175:00: System too rich (LH)
DETECTION CONDITION	P0172:00 indicates that the fuel/air ratio is too rich (RH). P0175:00 indicates that the fuel/air ratio is too rich (LH). The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.
POSSIBLE CAUSE	Fuel System: Leaking fuel injectors Fuel return line restricted Fuel rail pressure sensor bias Damaged or leaking fuel pulse damper Purge solenoid valve is leaking when the canister is full Base engine: Engine oil contamination Intake Air System: Leakage in intake air system Contaminated MAF sensor Electrical System: MAF sensor malfunction PCM malfunction

DTC P0172:00
DTC P0175:00

P0172:00: System too rich (RH)
P0175:00: System too rich (LH)

DETECTION CONDITION

P0172:00 indicates that the fuel/air ratio is too rich (RH).
P0175:00 indicates that the fuel/air ratio is too rich (LH).
The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.

POSSIBLE CAUSE

Fuel System:

Leaking fuel injectors
Fuel return line restricted
Fuel rail pressure sensor bias
Damaged or leaking fuel pulse damper
Purge solenoid valve is leaking when the canister is full

Base engine:

Engine oil contamination

Intake Air System:

Leakage in intake air system
Contaminated MAF sensor

Electrical System:

MAF sensor malfunction
PCM malfunction