yes your car should be fine, since you dont have headers just reset the ecu and it could possibly stay off. dont waste your time continually resetting it unless you are getting emissions done.

 

Get an O2 simulator from summit racing, or turn your car around to get the O2 bung behind the second cat. You'll have to extend the wires if you do this, but either way will work.

 

^^^yes that does work. i just got my safc2 and have been messing with it and have tuned and since doing so my light went off . on top of that, you can also get some performance gains if tuned well, i think that it was worth every cent.

 

I am throwing code 421 also. I have reset my ecu and I checked it after driving 200 miles, no cel. But the code comes up 421 and mil (malfunction indicator light) is pending. I am in New York, if I reset my ecu I have to drive a certain number of miles or when i take it in for inspection they will know that I reset the computer. Can anyone help me? I guess, what I am looking for is the second o2 sensor. I know where the first o2 sensor is right behind the radiator on the exhaust manifold. Is the second o2 sensor easy to get to? I am newbie so if I am asking something that has all ready been asked... sorry. I have been searching for the right answer.

By the way I drive a 2002 Lancer ES

 

If you look under the car and locate the cat converter, you'll see the second o2 sensor attached to it. RRM sells a fix for that.

 

thanks blaze

I appreciate all that help us newbies, like I said I am a newbie but I am a fast learner.

Many thanks, hope to be up and running legal again real soon!

 

2 18mm atnifoulers is the best fix. THis is what I use. No CEL after 10k miles... no wiring, no resistores, just a little bit of alluminum :-) PM me if you need further info.

- Andy

 

ok since its the 421 thats is a recal for our car 2002 2003 lancers just bring it into the shop .. i mean mitsubishi and they will reflash your pcm then it should be goood

 

I think you should go back to the first post and start reading.

That means he doesn't have the factory exhaust manifold. That means the recall doesn't apply to him.

 

im running 2.5 cat back and the factory warenty still applies

 

You don't get it hein??? The recall you're talking about has to do with the FACTORY exhaust manifold throwing a code. This guy DOES NOT have the FACTORY exhaust manifold. It's not a matter of voided warranty(and in it's case it's obviously not under warranty anymore since he's boosting) it's a matter of fixing the right problem with the right solution.

P0421 can occur for different reasons
1. Mitsu lack of pickyness when they first programmed the Ecu
2. No cat in the exhaust manifold

The recall applies to situation #1 only.

Right now you're telling this guy to go to a Mitsu dealer to get his ecu re-flashed so he doesn't mess up his first cat converter. Well you know what? He doesn't have the first cat anymore.

 

lol reminds me of that time i started up my old '79 350ci camaro and just stomped...after a short while it sounded like a baseball bat was hitting my block (aka slung rod grinded crank shaft.../cry)