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  1. 2006-2012 Eclipse (General 4G)
    Hello, I have a bad Catalytic converter on Bank 1...I've tried all the "cleanup" chemicals . Tried the one that goes into the gas tank and also the one that goes directly into the air intake after the filter. No success. I have been offered by my mechanic to "gut" the catalytic and place a...
  2. 2006-2012 Eclipse (General 4G)
    Is it worth? I think I need to flash it to fix my P0421 code. What is the process?
  3. 2006-2012 Eclipse (General 4G)
    I got this new Rabbit and before I got an inspection sticker(2007 GT V6), It is throwing p0421. I need sticker in a week and I have no idea how to get it done. MA state. Do you know any mechanic nearby who can fix and get the sticker done? As I have already spent money, I do not want to...
  4. 4G Eclipse GS/SE Specific
    Hey everyone! My son's 06 Eclipse 2.4L died last night on the highway. His CEL gave the codes of P0421 & P0431 as well as P0102. I understand that the codes mean that the cats are bad but the P0102 was for the MAF. The car will start up but will die immediately without feathering the gas...
  5. Problem Reports
    I've been browsing the forums for the code P0421 and it seems many people have this issue. I have read Desert Rat's post about this problem on the constantly asked questions but this is for when the SES light is on, and mine is gone. In addition to this, I have also recieved P0174 and P0171 but...
  6. Problem Reports
    Just recently had oil change they said i had lost some oil which caused my oil light to be on. They said it may be something wrong with the low end of motor or oil pump. Any suggestions on what to start with. I have 217,000 miles so it might be time for new seals, just wondering what all I could...
  7. Problem Reports
    I have an 07 GT Spyder with 122K miles. It's my DD and she still purrs like a tiger. I got these error codes last week while driving back from work. I read the codes after I got home, and hoping it was a 1 off I cleared the codes and the SES light stayed off for about a week. Now the codes are...
  8. Problem Reports
    I have a 2006 Eclipse GS and the check engine light has been on and I hooked up my code reader and it gave me the code P0421 (Warm-Up Catalyst Efficiency Bank 1 is Below Threshold). I've been researching a lot on here and it's between the 02 sensors and the catalytic converter. People seem to...
  9. Problem Reports
    Hi I've been getting the code P0421 and low gas mileage. First thing I checked was if my spark plugs were fouled up. When I checked them, all my spark plugs had oil. So I replaced the valve cover gasket and spark plug well gasket thinking that might fix the problem. I erased the code and drove...
  10. Problem Reports
    I have a 2006 Eclipse GT and have a P0421 code. I know it's the warm-up cat, but can someone who knows more take a look at my O2 logs? Why is my bank 1 upstream sensor not fluctuate as much as the bank 2 upstream sensor? Here are 3 pics - vertical screen cap, horizontal, and one when I give it...
  11. 4G Eclipse GT/SE Specific
    Hello, first time poster these forums have helped me a lot thus far. My car has 94,000 Miles I just got a full timing belt replacement done on the car, everything else appears to be in great condition as the car was originally from Florida. When I am at idle my RPM barely moves, however there...
  12. New Members Forum
    I'm new to the eclipse and i love mine. But I am running a p0421 code. the cat con on the left side has already been replaced once so i didn't know if i had a chance of it being something else. i looked at the other thread about the p0421 and i was hoping for one of those other two problems(o2...
  13. New Members Forum
    Just bought a 2006 Eclipse with 105,000 miles. I got it for $5600. Did i pay to much for this vehicle? Also the damn SES light came on, took it to AutoZone and came back with P0421. It had 3 possible problems, so im hoping its just the O2 sensor. I also hope this isnt a sign as whats to come...
  14. 2006-2012 Eclipse (General 4G)
    I got a 2007 Mitsubishi Eclipse GT with 46000 miles and it has codes P0431 and P0421. I've been looking at lots of posts and people are saying that I can fix it either gutting the cats or getting new headers. I called the dealer and they said that the cost for fixing this (getting new catalytic...
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