1

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?

  • They were changed in April,2014 so about 10,000 km. All are irredium. – ahamed Nov 4 '14 at 1:13
  • no. The problem has been solved by changing one coil and cat repair. – ahamed Nov 15 '14 at 23:16
2

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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