MT-021-17
Service Bulletin Details
Public Details for: MT-021-17
Some vehicles may experience the check engine light on with dtc P0171 (fuel trim too lean) and possibly dtcs p030x (misfire). Vehicles having this concern should use the following inspection/repair procedure.
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Models from 2018
2018 MAZDA CX-3 |
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2018 MAZDA MX-5 |
Models from 2017
2017 MAZDA CX-3 |
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Models from 2016
2016 MAZDA CX-3 |
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2014 MAZDA MAZDA6 |
Models from 2013
2013 MAZDA CX-5 |
2013 MAZDA MAZDA3 |
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2012 MAZDA MAZDA3 |
Mazda North American Operations Irvine, CA 92618-2922 M-Tips Subject: ALL SKYACTIV MODELS (2.0/2.5L) - CHECK ENGINE LIGHT ON WITH DTC P0171 M-Tips No.: MT-021/17 Last Issued: 12/05/2017 DESCRIPTION Some vehicles may experience the Check Engine Light ON with DTC P0171 (Fuel Trim too Lean) and possibly DTCs P030X (Misfire). Vehicles having this concern should use the following Inspection/Repair procedure. REPAIR PROCEDURE Inspection Procedure 1. Inspect the airbox/air filter for proper fitment and repair if necessary. 2. Inspect the MAF for correct operation according to the instructions on MGSS and repair if necessary. 3. Inspect the A/F sensor for correct operation according to the instructions on MGSS and repair if necessary. 4. Inspect the Fuel Trims during normal engine idle condition. If fuel trims are normal after performing steps 1-3, repair is complete. If fuel trims remain abnormal, continue to Repair Procedure. NOTE: P0171 will set while the engine is idling or the vehicle is driven and the fuel feedback correction amount reaches the upper limit ( 25 % or more) for 20 s or more. Repair Procedure 1. Replace the fuel injectors 2. Verify fuel trims have been corrected. If the Check Engine light turns on again, follow the Repair Procedure in the WSM. Page 1 of 1 An editorial board comprised of MNAO service staff members generates, collects, and verifies information for this publication. To contribute repair tip ideas, send an e-mail to [email protected]. All contributions become property of MNAO, which assumes permission to publish them without further consideration. © 2017 Mazda North American Operations, U.S.A.