Mazda 6 Service Manual: Dtc p0121

Diagnostic procedure

Mazda 6 Service Manual: No.2 neither abs warning light nor brake system warning lightilluminate with ignition switch on
When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, check to make sure connectors, terminals and ...