Diagnostic procedure
Mazda 6 Service Manual: Intermittent concern troubleshooting
Vibration Method
1. If malfunction occurs or becomes worse while driving on a rough road or
when engine is vibrating, perform the steps below.
Note
There are several reasons vehicle or engine vibration could cause
an electrical malfunction. Some of the things to check for are:
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Mazda 6 Service Manual: Warranties for Your Mazda
New Vehicle Limited Warranty
Powertrain Limited Warranty
Safety Restraint System Limited Warranty
Anti-perforation Limited Warranty
Federal Emission Control Warranty/California Emission Control Warranty
Emission Defect Warranty
Emission Performance Warranty
Emission Control Warranty ...