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Forum > Failed Smog Test > Question

1999 Dodge Dakota V8 2WD failed for modified Catalytic Converter (CAT). Why?

I failed a smog inspection because the results of the catalytic converter states its been modified. The technician did't explain what that means or what the modification is? I purchased the vehicle used, but according to the carfax the converter was installed by a Dodge dealer a couple of years before my purchase.
Answer:

We won't be able to tell exactly why the CAT was considered modified without seeing it. However, common modifications are plugged AIR injection ports on a Three-Way CAT (which your truck should be equipped with), also if the CAT which was used is not an original equipment manufacturer (OEM) part this too would cause a modification failure. Mind you this doesn't mean you have to buy the CAT from the dealership; OEM parts are widely produced by aftermarket emissions parts companies. The important thing is to ensure the "right" OEM Catalytic Converter was installed on your Dodge Dakota. posted by SmogTips Support

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