1996 Hyundai Elantra code

[Matthew]

I bought a code reader and it works.

The code is:

P0422: Main Catalyst Efficiency Below Threshold (Bank 1)

Anyone have experience with this? Possibly an O2 sensor?

 

[hyundaitech]

The converter is probably bad. Check both oxygen sensors to be sure they're operating properly. If so, you'll need a converter. I've only seen this code once where the vehicle didn't need a cat, and that was on a Sedona where the engine had been replaced and the mechanic apparently was colorblind; he swapped the front and rear oxygen sensor connectors. I don't think that's a possibility on your vehicle, however.

Any chance you're still within the 8/80 emissions warranty??

 

[Matthew]

123,000 miles +