pcode P0430

[tvacom]

I have a 2001 2.7 boxster with 107k on it. I got a check engine light and went and checked and it told me P0430 (Catylist efficiency below threshold

Bank 2, i believe).

Car was just serviced. I had just filled up with gas.I also just bought the car and had the CA smog test and it passed with flying colors. I took gas cap off and tightened back down. Cleared the code but now the idle goes from around 800 to 600 then catches itself as it feels like it is going to stall. O2 sensor?

Thanks

dave

[Loren]

P0430 TWC Conversion, Bank 2 – Above Limit

You can likely fix your idle with a good throttle body cleaning.

For the P0430 you need to check the O2 sensor before and after cat voltages. Compare the good side (bank 1) with the bad side (bank 2).

This code is signs of a bad (or going bad) catalytic converter. With 107k not too surprising. The O2 sensor voltages should tell you for sure.

I would clear the code and see if it comes back - cats are not cheap.

[tvacom]

Thanks Loren,

I cleared the code 4 days ago and it hasnt come back after about 200 miles. Is it hard to clean throttle body and get to the o2 sensors?

thanks

dave

[Loren]

What is wrong with your O2 sensors? Nothing here points to an O2 sensor problem.

Cleaning the throttle body has been covered here many times. It is not too hard.

[tvacom]

Just becoming a weekend mechanic so I wouldnt know if there was something wrong with the o2 sensor. I will look for cleaning throttle body and do that today and see what that does.

thanks

dave

[tvacom]

I have done searches and found other post but I dont see a DIY on cleaning the throttle body. Has there been one? Thanks

dave