Inspecting Mazda fuel trims

Jan. 30, 2024
Some Mazda CX-5 models have a MIL on with DTC P0171 (fuel trim too lean) and possibly P030X (misfire).

Some 2013-2023 Mazda CX-5, 2016-2022 MX-5, 201202013 Mazda3 Skyactiv, 2014-2023 Mazda3, 2016-2019 CX-9, 2014-2021 Mazda6, and 2016-2019 CX-3 vehicles may experience a MIL on with DTC P0171 (fuel trim too lean) and possibly P030X (misfire).

Inspect the airbox/filter for proper fitment. Inspect the MAF for correct operation. Inspect the A/F sensor for correct operation. Inspect the fuel trims during normal engine idle conditions.

If fuel trims are normal after the previous inspections/repairs, the repair is complete. If fuel trims remain abnormal, replace the fuel injectors.

Sponsored Recommendations

IA900WA Single System & Workflow: Wheel Alignment & ADAS Calibration

Sign in. Your browser can't play this video.. Learn more. 0:00 / 39:04. IA900WA Single System & Workflow: Wheel Alignment & ADAS Calibration | Autel. 50.6…

Voice Your Opinion!

To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!