News Technical Service Bulletins

Oily Connector for Mazda

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Note the location of the C-34 emission harness-injection harness connector. The connector color is black.

Some owners of 2007-2015 Mazda CX-9 vehicles may complain of a check engine light on while driving. If diagnostic trouble codes (DTCs) P2A04:00 (HO2S LH circuit range/performance), P2272:00 (HO2S LH signal stuck lean) and/or other DTCs are found, inspect the C-34 connector for engine oil contamination.

If contamination is found, inspect the engine oil pressure switch for external leaks. If a leak is found, replace the oil pressure C-34 connector and harness of oil contamination.

Inspect the relayed O2 sensors according to the instructions on MGSS online. If the related O2 sensors are not operating correctly, replace the affected O2 sensor(s). Clear DTCs and test drive to confirm the repair.

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