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Hi, I thought I had replied to this. My 2001 Protege ES has 100K on it and I had a cylinder misfire from a coil pack that died. I replaced the coils, plugs, and wires then cleared codes and the P0421 came back. In addition the car was running very badly, but when the exhaust gasket blew it...

Hi, I'm trying to find out what the going rate for a Warm up Catalytic Converter. The place I had my car checked out wants $1000 to do it with $750 of that in parts. I don't believe that, so I'm here to see if thats a fair price. If so I'll have them start tomorrow. Otherwise I'll take it...

Hi, I'm stock all the way around. No test pipes or mods. Given what you've said, and what I've read I think the Catalytic Converter fried. I've got an appointment with good mechanic tomorrow morning. we will see how it goes. Just as an Update it started making a sound like the Jetsons...

Hi, I'm showing P0421. I had a p0301 and I replaced Coils, Wires and Plugs and it cleared that up, but the P0421 remains. I meant to mention I have a 2001 Protege ES 2.0, I just caught this thread in a search, sorry if it's misplaced. How would a catalytic converter problem affect...

Hi, If I may, how has this problem affected operation of your car? I'm getting the same code, and it is causing more problems as I try to accelerate or at freeway speeds. When the car is cool it seems to run OK. Any help you can give would be appercaited. Thanks and Have a good one. Shawndoe