[gears]

03 Check engine light (code P0420) Catalytic converter. About a month ago got the same code had the catalytic converter checked, was told it was bad, replaced the first catalytic converter next to the engine. Yesterday the check engine light came back on with the same code. NEED HELP!!!!!

Could the second catalytic converter be bad??
Could the second oxygen sensor be bad??
????????

 

[HeavyStyle105]

ok here is what you do you go back to the place you had the cat put on at and you smack them in the head with a 2x4. no really if you had it done profesionally they should take care of it. if not get a new mechanic or go back to step one. good luck

 

[gears]

Went back to the muffler shop, they found a leak around the gasket.

 

[MoTNguy]

Hi all. Before buy the service technicians story on the cat, check out my story and try the fix. It cost me $8.00 to "legally" turn off the P0420 induced CEL. My03 started pushing the code about a year ago. Got the same response from the techs as you. However, the light went out when I spent a week in Florida last July driving on Florida gasoline. Drove home on FL gas, no light. Fill up with Tennessee gas, CEL is on 16 miles later. It aint the cat, it's the ethanol blended gasoline. I suspect the programming genius did not take into account the possibility of the usage of ethanol blended fuel and thus the P0420. I have Honda throwing same code. I employed this fix on both vehicles and no light.
Go to this link: http://www.honda-tech.com/showthread.php?t=2162522. Follow it exactly and you have a good chance of ridding yourself of the P0420 CEL and saving yourself enough money to go for a nice vacation.