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Forum > Failed Smog Test > Question

2005 Acura TSX - Failed OBD II Monitor Self Test - Monitors were incomplete.

I recently took my car (Acura TSX) in for a smog check and it passed all except 1 item. It failed due to: MIL/Check Engine Light On due to failure to successfully complete all OBD self tests. I don't drive the car that much and I did have a new battery installed back in November 2010. I want to know how to fix this when I bring back for retest.
Answer:

Your Acura TSX is equipped with an On-Board Diagnostics (OBD II). The OBD II system monitors all aspects of your Acura's emissions system conditions and reports information to the OBDII computer. The data is processed and checked against the computer's pre-determined values for various inputs levels and performance patterns of your vehicle. If any problems are found the computer will determine whether to alert the driver or not.

 

Since your Acura TSX's battery had been recently been replaced, the emissions monitors were erased from the OBD II computer. Setting the emission monitors requires driving your car at least 200 miles; consisting of everyday normal driving, stop and starts (like at red lights and traffic), ignition on and off several times a day with at least 15 minute pauses in between (this allows the EVAP monitor to run), and freeway driving at least on three occasions for at least 15 minutes each at speeds above 30 mph.

 

After these driving conditions are met and your Acura still fails the OBD II portion of the smog check, we can only recommend a smog check repair center conduct a diagnosis of the OBD II computer as to clues of why the monitors are not setting. Assuming no Check Engine light or Malfunction Indicator Lamp is illuminated we have to suspect your vehicle's only problem is simply not enough drive time yet.


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