20K/Service Engine Soon

[Shiroelex]

P420 sounds like that code, 'Catalyst system below threshold.' to me. That's most likely one of your high-flow cats going bad. I've had this code come up every now and again, whenever someone brings me a car that has the cheap splice-in MIL eliminators, that are twisted together and covered in electrical tape. What that code means, is the signal between the front O2 sensors and the rear O2's, are too close to the same. The cats change the gases that come out of your engine, and the rear O2s are there to make sure the cats are doing their job. The code could be because of an O2 that is going bad, but they usually throw their own codes. I would look into clearing the code, and running a full tank of mid-grade gas. Sometimes that helps. If the cat is totally dead, you could temporarily get a MIL eliminator for that sensor to get the car back into closed loop. Good luck!

 

[Shiroelex]

Oh, also, I looked in my book, it says that code is coming from Bank 1, which will be the side that cylinder 1 is on.

 

[jefferz]

I know the bad cat is on the driver side. is that bank 1?

 

[Mike97gt]

I usually tell people on here to get their codes scanned, and then to post them on here. There's enough knowledgable people on here, whom could figure out what your problem is.

I've seen so many parts replaced, that didn't fix the problems they were supposed to. *coughDPFEcough*

well the DPFE is not the magic fix for all problems. so i don't know what you mean by this dpfe cough stuff. i find it kind of funny you pick the exact part i use in my example

and we can help on here BUT some problems need to be seen first hand.i can tell sombody how to do some of the tests but i or any other member have no way of knowing if it was done right. plus many tests you can not do at all unless you own a 10,000 dollar WDS or IDS.

 

[Mike97gt]

I know the bad cat is on the driver side. is that bank 1?

bank 1 is the passenger side.

 

[jefferz]

ok then maybe it was on the passenger side lol....thanks for the help guys. Now I just gotta either sell this H pipe or put another cat on it...I can't decide.

 

[bdcardinal]

a WDS is a fun toy to have, assuming the battery works, and the hard drive isnt fragmented.

 

[Mike97gt]

a WDS is a fun toy to have, assuming the battery works, and the hard drive isnt fragmented.

yep. IDS is 1000 times better, same software but based on a modern laptop. ford is starting to roll out ids now

ok then maybe it was on the passenger side lol....thanks for the help guys. Now I just gotta either sell this H pipe or put another cat on it...I can't decide.

just toss a pair of 02 sims up there and call it a day. most aftermarket catted pipes throw codes. the tolerance for cat inefficiency is small. most likely you will still get a sticker as long as the light is off.

 

[bdcardinal]

thats good about the IDS. i took an electronics class from a engineer at the company that makes a lot of the OEM scan tools. he was ragging on the WDS a lot, i guess honda has one that has a mother unit like a big scan tool, and then has a smaller pda for little jobs.

 

[Mike97gt]

thats good about the IDS. i took an electronics class from a engineer at the company that makes a lot of the OEM scan tools. he was ragging on the WDS a lot, i guess honda has one that has a mother unit like a big scan tool, and then has a smaller pda for little jobs.

we also got a pda one being rolled out called PDS. the PDS will be able to do most stuff like scan codes, power balance, relative compression, live data pid monitoring, active commands, key programming, module config and programming.

the IDS with the VMM kit will be able to go deeper and do fuel injector tests and ignition tests. pretty much anything you need advanced diag you use the ids. 99.9999 percent of the time PDS will get the job done.

but that .0001 percent has my favorite tests in it fuel injector flow test and ign tests. that fuel injector flow test has helped me a lot.

 

[Shiroelex]

well the DPFE is not the magic fix for all problems. so i don't know what you mean by this dpfe cough stuff. i find it kind of funny you pick the exact part i use in my example

and we can help on here BUT some problems need to be seen first hand.i can tell sombody how to do some of the tests but i or any other member have no way of knowing if it was done right. plus many tests you can not do at all unless you own a 10,000 dollar WDS or IDS.

I didn't actually mean to quote your part like that; sorry about that. What I meant, was exactly what your situation was. I used to get all sorts of people in my shop that would say "Autozone said this, Autozone said that, EGR blah blah blah". I'd just do the DPFE, which isn't mentioned in the cheap scanners AZ uses, and problem solved, most of the time. It's all about troubleshooting, if you don't have all of the common parts that break memorized.