Diagnose with Confidence Unraveling OBDII Failures in CAN Safety Tests

Some drivers fail their emissions inspections with a Not-Ready Rejection VIRS. Your OBD-II must have the sensors at the ready before a mechanic can complete the ... Hey Gang, My dad took in his 2004 E320 to have it emissions tested. They said they could not test it because the computer wouldn't respond. Explanation of OBD-II diagnostic trouble codes (DTCs). Before DTCs became commonplace, diagnosing issues could be time-consuming. With OBD-II, vehicles can ... The fault could be caused by something else in the systems that the sensor is monitoring. For example, oxygen sensor lean or rich faults are ... If there is no communication through the OBD2 port then check the fuses. I believe it is one of the 10 amp aux fuses. Whenever I would hook up ... An OBD-II code reader can provide a numerical trouble code that pinpoints the underlying problem. This code offers guidance, assisting you or ... It could be the ECM ground, or a ground from the ECM (as most have multiple grounds). Bad/no grounds have very weird results. If you turn the ... If too many readiness indicators are "incomplete," the vehicle will fail the inspection because it means that the vehicle has not been operated ... OBD II systems must indicate whether or not the vehicle's PCM's monitor system has completed testing on each component. Components that have been tested will be ... The vehicle fails the OBDII emission test due to non-communication, but has passed the safety and tamper portions of the inspection. Owner takes the vehicle to ...