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Failed Smog Test

1996 Geo Prizm Failed Smog for High HC

My car is a 1996 Geo Prizm that has failed smog twice. Any ideas why? It failed in the HC section. Got 119, the max is 64 at 15 mph. just made it on the 25mph section getting 47 where the max is 47. I got a tune-up and the numbers got worse at 15 mph now registering 130. Stayed the same at 25 mph.


All three emissions the smog inspection tests for (HC, CO and NOx) are interrelated. One's results can effect the others. It is important to know what the CO results for your Geo Prizm were as well, in order to determine what the cause of the high HC fault is. 

The main reason your Geo Prizm may have been producing high HC could have been due to the ignition system, but since you mention your car was recently tuned-up and still failed (with even higher HC), we have to assume there are other faults. We recommend having a certified smog check repair center conduct a hands-on smog check failure diagnosis. Follow the link for more information on High HC.

posted by SmogTips Support 07-24-2015 10:08 AM
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