P1175 Possible Causes
- Clogged fuel injectors
- Faulty oxygen sensor
- Ignition problem
- Fuel injection problem
- Engine mechanical condition
How to Fix Code P1175?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Technical Notes
The code is sometimes triggered by clogged fuel injectors. Start by using high-octane fuel and/or a fuel additive to clean the injectors. If the problem persists, the fuel injectors may need to be replaced.
Possible Symptoms
- Engine light on (or engine service warning light soon)
P1175 Meaning
The fuel cylinder balancing diagnostic detects an imbalance in the air/fuel ratio between cylinders and cylinders in each row. The diagnostic monitors the frequency and amplitude characteristics of the pre-catalyst heated oxygen sensor (HO2S) signal by calculating an accumulated voltage over a predetermined sampling period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.