Search Results for ‘p0420’

hey y'all, i just picked up a 2001.5 passat 1.8 5 speed that developed a misfire while driving home immediately after buying it, I changed all 4 plugs and coils and the misfire went away. I reset the CEL by disconnecting the battery and drove for about a week before it came back on with the...

Hi there! This is my first post on passatworld. My daughter bought a 2003 VW Passat GLS 1.8 L Turbo with 140k with the CHECK ENGINE LIGHT ON! This was 2 years ago and we've been suffering ever since. So the first thing we did was replace the catalytic converter with an after market one from...

Hi, I have a b5.5 and recently got a p0420 catalyst threshold below efficiency. I really don't want to buy a new catalytic converter as I want to do all the least expensive parts first. here were my fuel trim readings: STFT3: -100.6% STFT1: 4.6% Load value: 7.8% LTFT3: -100.6% LTFT1: 2.3%...

So I'm getting ready for the lovely PA State Inspection and she (2005 4motion wagon 1.8t, 156K) decides to throw a P0420 at me, was intermittent and now it just won't go away. So Ross Tech says: 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes Leakage...

So, long story short, after fixing some other codes/issues I still have P0420 on my 2003 1.8t AWM and need to pass emissions. I will be leaving the country in a few months and getting rid of the car anyway, so I don't want to dump a bunch of money into it and also don't want to buy another car...

Checked the software version and found it falls within the versions affected by the strict 02 sensor settings. Already called a stealership and they said it would be an hour's labour to do the reflash( :wrench: ), is it possible to just disable this alert through vcds as I do not need emissions...

I am new to VCDS, i got a p0420 and P1479. Can i troubleshoot my O2 sensors on the computer only once i have a registered vcds? or can i do anything besides find out what codes i am throwing with the free version? can you point me where to start on the VCDS cause all i know how to do is press...

'05 1.8T 5A 4Motion 105,000 miles I've had P0420 pop up around 5,000 miles ago after using junk gas on a trip, about 200 miles into the tank. I filled with better quality gas, reset the light, and all was fine... until Monday. While entering an interstate on-ramp, it started to sputter and...

Drove today and after three miles, had some hesitation for a minute, then seemed to run fine. CEL was on so took it to Advance Auto and checked it on OBD2. Came back as codes P0130 and P0420. Reset the codes and drove home, again, after 2 or 3 miles, it had some hesitation but then ran fine...

My 2002 1.8T has been getting a recurring P0420 CEL a couple times per month. Car hasn't been running rough, no misfires, no other codes. Either I will clear it with the Vag-Com, or it will go away by itself. Either way, it keeps coming back. The car seems to have the normal amount of power...

2002 Passat 1.8T AWM with 166,720 miles. I do my own oil changes with Mobile1 or Castrol full synthetic every 5000 miles, never overfilled. No misfires, car is properly maintained. No drop in mileage. Get 28 hwy, 20-24 city. There is a VCG leak that I haven't had the time to tend to...

2001.5 VW Passat 1.8t, Automatic Trans, Engine Code: AWM, Sedan Today during driving my car threw a CEL. Checked it, p0420. Im thinking: "Hmm... This sounds familiar". I looked up the forum and people say 3 things: Cat, o2 sensor, exhaust leak. I've seen some threads people mentioning vacuum...

2002 Passat 1.8t AWM 157K. Recently I got OBDII code P0420. I took readings with a IR thermometer and got 700 degrees precat and about 400 degree post cat. No problems when driving besides the check engine being on. I'm confident I can replace it on my own but am concerned about snapping the...

Last tank I ended up with 17.8 MPG. That's a bit rough. I currently have a P0420 that went off and then came back… Which o2 Sensor has the greatest effect on mpg? Could a clogged cat really kill my mileage that much? Other thoughts?

It was annual emissions time and my girlfriend's 2002 Passat 1.8T (AWM/5 speed manual) had the check engine light. Sadly we've been chasing CELs for years, fixing eval system leaks (various hoses as well and the oil fill tube). This time the errors coming out were: P0300 - Cylinder Misfire...

So I recently (as in 3 days ago) bought a B5.5 Passat Wagon. Drove the car a good ways home without any issues. The only issue I knew about was a bit of vibration when sitting still in Drive. I wrote it off to a bad motor mount. I came home, disconnected the batter to clean out the tray and when...

Had the CEL come on the other day. Tech scanned it today and found only 1 code, P0420 which is "Catalyst System; Bank 1: Efficiency Below Threshold". Said O2 sensors were fine, but one behind cat was alternating 0 and 1V constantly indicating cat failure. Could this cause limp mode? I realized a...

Hey guys!! I recently had a low oil pressure issue on my 02 passat 1.8t that I just fixed. Afterwards, I got a P420 code for the Ctalytic Converter!! I was wondering if the low oil pressure had anything to do with it? Also, how long do CAT's usually last? Thanks!!!

So ive had my car for a couple months now. 2005 1.8t AWM. 93,000 miles. Check engine light now comes on after only 25 miles of driving. Code P0420 Lower limit exceeded. Runs well in my opinion, gets about 27 mpg when i drive 60/40 highway city. I fixed some clogged/leaky pcv stuff Run only...

Hi, I am long time lurker but first time poster. I had a question, I am getting the P0420 and P0430 error codes on my car and i know my Passat has not received the TSB that updates the ECU to correct this. My question is, if i get a GIAC flash on my car, will this address that issue with the...