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On a 2005 Lexus RX330:

P0304 Cylinder #4 misfire.

What is the cause and is it a big job to fix?

P0430 Catalyst system efficiency below threshold - Bank 2.

Is this a big job?

Is it OK to run the car without fixing them?

Zaid
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ahamed
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1 Answers1

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The OP resolved this issue as per his comment:

The problem has been solved by changing one coil and cat repair.

So the reason for the misfire was a bad coil, while the catalytic converter had to be "repaired", possibly replaced due to clogging.

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Zaid
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