Expert Insights Decoding OBDII Failures in CAN Safety Test

If the ECU commands the check engine light to illuminate, there will always be at least one P0 code stored. However, sometimes there are “pending codes”, which ... 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 ... Block drive wheels before performing a test with engine running. A moving vehicle can cause injury. Important Safety Instructions. For a complete list of safety ... Vehicles that fail due to non-communication fail because the vehicle's onboard computer did not send a signal to the emissions testing equipment. Occasionally, ... An incorrectly tightened gas cap will activate the check engine light. A malfunctioning oxygen sensor is another common offender. Oxygen sensors ... Vehicles will fail the OBDII test if too many monitors are unset at the time of testing. For 1996-2000 vehicles, three or more unset monitors ... It's also possible that a defective component in your vehicle may be preventing your vehicle from completing readiness monitors. Your best bet ... This reference information provides both a summary of pass/fail standards for the On-Board Diagnostic (OBD) test portion of a Smog Check inspection and ... Devices like an OBD-II code reader can read diagnostic trouble codes (DTC) that the system stores when something goes wrong. Typically, at least one code is ... 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 ...