[kenr427]

I bought an 02 DeVille with 144500 miles a few weeks ago that had the check engine light on. It runs great but has codes , I have P0101, P0420, P0741 showing. Hoping that it may be a simple fix cause I love this car. I'm new to here and have been looking around trying to find my way! There sure is alot of info here!

Ken

 

[MoistCabbage]

Codes are meaningless without definitions.

I think P0101 is a MAF code.

P0420 is catalyst inefficiency I believe. You'll need a new car if so. Walker or Eastern are good replacements.

P0741, depending on where you live, is either completely ignorable, or a very expensive repair. If you need to pass inspection, the fix is a new catalytic converter and some internal transmission seals. And a new TCC solenoid while its out. Many, many, MANY threads on this issue.

 

[kenr427]

I read somewhere that it could be the O2 downline sensor showing a bad cat and which could also throw the P0101 code. It runs great, wouldnt a bad cat effect running?

 

[Ranger]

Welcome :wavehi:

A bad CAT will not affect the running.

I can't swear to it, but I think a bad down stream O2 sensor (Bank 1 sensor 2) MIGHT cause a P420 code........at least I hope so. I just replaced the CAT on my daughters '04 SLS because of a P420 code. Drove it 2000 miles to PDX without a hiccup or code, and now she is getting the P0420 again and and occasional P0141. I am praying that P0141 is causing P0420.

 

[kenr427]

I cleared all the codes and put on over 500 miles, no codes showing as of yet. Running fin for the most part, do notice a surging at idle of about 200 rams and only when warm. Possible vacuumed leak?

 

[Ranger]

Entirely possible.

 

[basscatt]

I cleared all the codes and put on over 500 miles, no codes showing as of yet. Running fin for the most part, do notice a surging at idle of about 200 rams and only when warm. Possible vacuumed leak?

==========================
start by cleaning the TB - Throttle Body -
and IAC Idle Air Control solenoid -

 

[kenr427]

Only code that keeps showing up is the P 0741 and I'm due for my NYS Inspection, will it pass with this code showing up?

 

[Submariner409]

P 0741 says "TCC stuck off" and that is an emissions system - fail. That specific code usually points to a set of seals in the torque converter shaft hub and in the transmission output shaft sleeve - an internal oil leak. transmission and converter removal required.

If accompanied by P 1860, that's the operating solenoid itself, buried inside the transmission. 8 hours of microsurgery (Tech Tips) or a GOOD transmission shop.

 

[Ranger]

:yeah: and it's an expensive repair.

 

[basscatt]

Only code that keeps showing up is the P 0741 and I'm due for my NYS Inspection, will it pass with this code showing up?

===============================
will it pass with this code showing up?
NO -
long story short - it's caused by a worn seal deep in the trans -

around $2000 to $2500 to fix -

if you want more information - with pics of the worn seal - go here -
http://www.cadillacforums.com/forum...on/149834-information-p0741-p1860-1998-a.html

and before you ask - or try -
there is absolutely NOTHING that you can dump into the trans -
that will have ANY positive result -

and NO - there is absolutely no way to "fool" the system -
EXCEPT -
drive around keeping your speed at or below 40mph -
long enough to get the computer into the "READY" state -

 

[kenr427]

So is it a good idea to put 2800 into a tranny repair on an 02 deville with 150k on it? Body is great, everything seems good,

 

[Submariner409]

Depends on what the car is worth to you. I, and others here, would not blink twice if the transmission needed major service. Many others would scrap the car.

 

[kenr427]

Had the tranny repaired for 2400. Now it's gotta go back because it won't start out in low

 

[Byrdman]

my 03 DeVille base throws the P 0741 code about once a month. I clear it and keep going. Fortunately, I don't have emissions testing in our county and i don't care that the fault may cost me 2 mpg or so. Sub is correct--if the tranny needed major service, I'd do it in a heartbeat and keep smiling every time I turn the key.

 

[Ranger]

my 03 DeVille base throws the P 0741 code about once a month. I clear it and keep going.

Eventually, it will become daily. Just a fair warning. I can now clear the code without taking my eyes off the road.

 

[Byrdman]

Eventually, it will become daily. Just a fair warning. I can now clear the code without taking my eyes off the road.

haven't tried doing it while driving. does that mean the OBD scanner can be operated with the car running and in gear? I've got the sequence memorized.

 

[MoistCabbage]

Yup. As long as the key is in the ON position you can pull the codes.

 

[basscatt]

haven't tried doing it while driving. does that mean the OBD scanner can be operated with the car running and in gear? I've got the sequence memorized.

=========================
and when you are done -
hit the ENG/MET button - twice -
to get out of diagnostic mode -