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Smog Check Repair
 

Nissan King Cab Check Engine Light On

The check engine light came On on my Nissan truck while back. The mechanic said not to worry and to ignore it. He said we'll deal with it when it's time for the smog check. Well now it's time and he says the monitors won't set and it won't pass the smog test. He thought it was oxygen sensor so he replaced it but it still won't pass and the monitors have a problem. Why can't he just fix monitors? The truck runs beautifully . I haven't taken it for an official smog yet at STAR smog station (required) - What should I do?


Answer:  

Emission Monitors are technically not repairable. Emission monitors are internal self-tests which the computer performs to make sure the entire emission systems is functioning properly. In order to pass the smog test, the check engine light needs to be off and the monitors must be READY or COMPLETE. To get the monitors ready requires driving your Nissan truck for 100-200 miles and over the course of a few days; in both city and highway traffic conditions. The truck should not have an illuminated check engine light and all emission systems need to be functioning properly. If both these conditions are true, the emission monitors will become ready for the smog test.

One caveat to making the monitors READY or COMPLETE is that if the original emission fault was not fixed before resetting the check engine light and clearing the codes, the fault will trigger the check engine back on before or during one of the emission monitor self-test. The solution is to have a smog check repair mechanic diagnose your Nissan King Cab's smog check failure. The repair has to be made properly, the computer reset, the truck be driven for a few days (and at least 100 miles), and then obtain a smog check retest.

Do not obtain a smog check with the check engine light on; your Nissan King Cab will fail the smog retest. An experienced smog check repair technician should be able to extract the trouble code(s) and and use that information to repair the fault which is causing the light to illuminate.

As far as having erased monitors... it is very possible that while the auto repair mechanic attempted to repair your truck (replace the oxygen sensor) they cleared the existing trouble code(s) in the computer, as well as the "emission monitors" (which is required and standard protocol).


posted by SmogTips Support
 


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