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How to reset the AdBlue warning light on the Mazda CX7

Model: Mazda Cx 7 MK 1 - Years 2006-2012
Part: AdBlue warning light

In this video we see how in some cases, the DPF light on the Mazda CX7 can be reset without using an OBD2 scanner, using a manual method that involves grounding a specific cable. This procedure is useful if you do not have diagnostic tools. We will need an electrical cable and a key, to mount any covers. Identify the correct cable, which is the gray/black one in the area of the ECU, near the engine compartment (where the DPF is located). Connect one end of the cable to the identified gray/black cable, and the other end to a battery ground. Now reset the ECU: turn on the electrical system without starting the engine, press the accelerator fully ten times in rapid succession, turn off the electrical system and wait a few seconds. Restart the engine: the DPF light should have been reset. If it remains on, repeat the entire procedure; perhaps we skipped a step.

Posted on 17 July 2025 by ScegliAuto

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