Hello, i am having this 3 codes showing, mostly 2 P0420, P0443, and the 3 P0304 sometime the car start shacking and mostly its fine.

So........

P0420 - Catalyst System Efficiency Below Threshold Bank 1

It was from the beginning and i would love to fix it but its kinda expencive and the smell is not good also.

P0443 - Evaporative Emission Control System Purge Control Valve Circuit

Before i use to hear some clicking sound when i switch the car to on and when i turn of i hear the click, but now i dont and since that this code showed, dose it have to do any thing with the click and is the Evaporative Emission Control System Purge Control Valve the one who do the click ?

P0304 - Cylinder 4 Misfire Detected

Is this the spark-plug ? in Cylinder 4 ?

Thanks

 

What's the year, trim, miles?

My 2006 constantly has an intermittent P0305 cylinder 5 misfire code.

Just for good measure,
Clean your throttle body
Clean your MAF sensor
Inspect/replace spark plugs
Check coil pack for corrosion

If you have a 2006, it could foretell of worse things to come. But start with the simple stuff. Do a search on the forum for those codes, you'll probably find good info.

 

yes its 2006 I5 H3 230000, i think i will do that, because , sometime when i turn up my car in the morning it shakes then after it hot its back to normal, but this happen one in a week or twice.

Thank you so much for the info.......

 

I'm guessing the following. ...
* http://www.p0420.com/
* http://www.obd-codes.com/p0443
* http://www.obd-codes.com/p0304
Chris