My 02 Accent runs badly, reading of P0300, 0301, 0302, cat converter runs very hot, what's wrong?


Asked by Dec 27, 2013 at 05:54 PM about the 2002 Hyundai Accent GL

Question type: Maintenance & Repair

I have replaced all the plugs, wires, coil pack, O2 sensors, cat converter and still getting
same reading and cat converter is still running very hot, what's next to do?

3 Answers


The 300 series of trouble codes are misfire codes. P0300 is random/multi cylinder misfire. P0301 is misfire cylinder number 1 and P0302 is misfire cylinder number 2. Since you have an in line engine cylinders 1 & 2 are next to each other. I'm suspecting a blown head gasket. Run a compression test. If those two cylinders are low that's what it's going to be. The head gasket has blown between the two cylinders causing loss of compression and the misfiring. The catalytic converter is heating up because the unburned fuel from those two cylinders is being burnt up in the catalytic converter (the hottest part of the exhaust system). It will need to be replaced again, after the engine repairs are made. HTH. -Jim

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Best Answer

Thanks Jim, now all I have to do is learn how to fix blown head gaskets...I'll keep you posted about any developments. Thanks again in advance!

1 out of 1 people think this is helpful.

You're welcome. Glad to help. Thank you for the best answer click. Yes, please keep me posted. -Jim

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