TSBs

Check the Mazda Fuel Trims

March 31, 2023

Some 2016-2022 Mazda MX-5 (Miata) vehicles may experience the check engine light on, with DTC P0171 (fuel trim too lean) and possibly P030X (misfire).

Information courtesy of Mitchell 1

Inspecting the MAF and A/F sensor are steps to complete before replacing the fuel injectors on the Mazda Miata.

Some 2016-2022 Mazda MX-5 (Miata) vehicles may experience the check engine light on, with DTC P0171 (fuel trim too lean) and possibly P030X (misfire).

Inspect the airbox/filter for proper fitment and repair if needed. Inspect the MAF for correct operation and repair if needed. Inspect the A/F sensor for correct operation and repair if needed. Inspect the fuel trims during normal engine idle condition. If fuel trims are normal, repair is complete. If fuel trims are abnormal, continue with the repair procedure as follows:

Replace the fuel injectors
Verify that fuel trims have been corrected.

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Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.