Mazda Repair Questions? Ask Mechanics for Answers ASAP
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Any time the PS light come on the system should be setting a fault code in the power steering control module. If you can have the system scanned and the fault code retrieved and post back with it I will try and help you determine the cause. The code Q0121 is not a valid fault code. Engine powertrain fault code should be P codes. Can you recheck this code please.