I recently failed emission test for my 1999 V6 Passat. I replaced the cats., thermostat, O2 sensors (before cats), and the list goes on. Is there a reflash in the ECM that needs to be reset that only VW can do with their scanner?
View 4 RepliesHow to clear the check engine light on 2000 Passat 4motion Wagon?
View 4 RepliesMy truck is currently stock and recently started making a knocking noise louder than it usually does. I researched and have found the injectors can make a knocking noise when not performing correctly. I took it to a local shop who hooked it up to a snap on scan tool and ran some tests. It passed the Buzz test but continually failed the contribution test on cylinder 8. I'm going to go home and remove valve cover and unclip the injector to see if the noise goes away. I'm sure hoping it does as an injector by the looks of things is definitely the cheaper option. I'm scared because if I was listening to a gas powered truck and heard the sound my trucks making I would assume it was a lower end noise. My truck only has 148,000 miles....
View 14 RepliesMy truck is a 91 sierra 2500 over 8600 gvw (8 lug) 5.7 4l80E. After my truck failed a Calif smog test I set about testing the different sensors that are attributed to the reason it failed (a few points high on HC's). All the smog equipment and sensors tested ok except for the 02.
I tested the one in the truck when it failed smog, it came out at 400 millivolts key on engine off as my Haynes manual and the Autozone website said it should, after running the truck for 10 minutes and running it at around 1200 RPM's for 2 min to get the O2 cycling it doesn't, best I have gotten was a slow rise of about 0.01 millivolt rise per second to about 0.590 MV where it seemed to level off, the problem is 2 seperate new sensors do the exact same thing, none cycle rapidly between 100-900 MV as the Haynes manual and the Autozone website say they should.
The 02 is pre-cat stock location, no changes to the exhaust since my last smog check. I don't even know if this is the reason I failed smog, it's just the only thing that didn't pass my testing. the truck does seem to be running a bit rich (per my ultra sensitive tailpipe sniff test).
I did do all the normal repairs after I failed the smog test, tune up, air filter, clean the TB run a can of cleaner through the gas tank, ETC, then I failed the re-test by 3 points worse. The truck does not run bad or blow a bunch of smoke, the truck is not throwing any codes.
I am new to a 2005 camry SE V6 3.3 lt, Today tested the security system by; locking the doors using the keyfob and waiting for 30 seconds for the system to arm itself then opening the door from inside the car. No alarm went off !!
The security Red LED on the dash works properly and shows no sign of malfunction. I am not sure how to start troubleshooting.
My 1992 Honda Accord failed the emission test today for a too high NOX reading. The applicable standard is 2.50 and my car's reading was 2.61. I've read that high NOX has something to do with a malfunctioning EGR valve. Will replacing the EGR valve guarantee that I pass the emissions test? I don't want to start throwing money at all kinds of parts.
View 4 RepliesI own an '01 Honda Accord LX with the ULEV engine and 178k on it. My CEL light came on about 6 months ago. Ran the scanner and it showed a P1457 (EVAP Leak). Waited until now when my inspection was due and expected it to be caused by the EVAP shut valve as I read that's often the cause of the problem with this code. Mechanic said that it can't pass inspection because of the OBD fail but that the diagnostic scanner showed everything functioning properly, including my assumption about the faulty shut valve.
He reset the code and said to drive it the 50 miles for the system to ready itself and bring it back in. As I've reset the code several times over the 6 months to see if it would self correct, I'm pretty confident it will come back on. My questions are, is it possible I've done damage to the onboard computer by not addressing the underlying problem 6 months ago? Are there emissions problems that are not checked by the diagnostic tool that the mechanic should be looking for?
I have a 1998 Passat 1.8 T with 137k miles on it that has been throwing the P0422 code. I've reset it at Schuck's and it has come back. Car is running fine and no rattle in the catalytic converter. Although it could still be the cat, it could just as well be something with the O2 sensors. Don't have a VAG-COM tool to check them directly. Is there some way other way to determine which O2 sensor it might be and/or if it is really the cat?
View 8 RepliesI took my car to the mechanic last week to get inspected and it wouldn't scan for emissions. It just wouldn't scan.. I guess the computer wouldn't even register that the car was plugged in to it.
View 10 RepliesWhat's the quickest way to check if the Check Engline Light is working?
I took my passat to get apr chipped. The shop spent few hours, and even worked with APR, and they could not figure what the issue is.
They were able to upload the software fine, but couldn't figure out which mode it is in, as they say my CEL isn't flashing, and therefore unable to switch modes.
APR got the shop to flash back the original software, and had them do a 'test'. I was told they tried unplugging a sensor, and the CEL didn't show, and made the conclusion that there is an issue with my ECU, which got me worried.
I am guessing they unplugged the MAF, as it is the easiest/closest sensor to unplug. And from what I read, it might not throw a CEL. In addition, APR's website state some B6 Passat Auto only support 1 mode.
Is there any easy way to test if my CEL is working or not? It lights up for a quick sec when I start the car, so I know it is not a fuse or bulb issue. Could it really be my ECU that is faulty? or is my ECU working ok, but only support 1 mode?
We are selling the girlfriends 01 Passat. I pulled the codes tonight for a long standing check engine light knowing it had one of the 02 sensors bad. Here are the three codes I received from the scanner:
P0130 - 02 Sensor Circuit Malfunction (Bank I Sensor 1)
P0455 - Evaporative emission control leak detected (large)
P0441 Evaporative Emission Control System Incorrect Purge Flow
So is it one thing causing all three or are there common things to look at. We can't really afford to go replacing all the emission system sensors and hoses etc. in hopes of finding the right piece. Gas cap is screwed on tight and codes were cleared a couple times to make sure.
I recently had some work done on my 2001 VW Passat 1.8T (timing, water pump, major tune up). IT had 72K miles.....
Now I'm getting the following:
Code P0171 Too Lean (Bank 1).
Emission Light turns on / off.
Check engine light comes on and stays on after about 20 miles. Can this be the oxygen sensor?
New owner of a 2003 1.8TPassat (29,000mi) as of the last 2 weeks and have just had my MIL come on. Scanned it at home with my Actron CP9125 scanner and got this code (P0455) which reads in the scanners manual as "EVAP Emission Control System Leak (Large)". Didn't know if this was a generic description of the code or VW has a more specific definition. What precisely this is in reference to, gas cap, vacuum hose????? Or what VW's actual description of this code is?
View 3 RepliesThrew this code p0442 evap emission control small leak. I see its a popular code to have....
View 14 RepliesI am getting the dreaded emission workshop.
The codes i am getting are p0301-p0304 and p0171
Which are misfire on 4 cylinders and system to lean (bank 1).
Here is what I have done:
Got the 4 ignition coils replace, replaced the mass air flow, replaced the air filter, replace the plugs.
I just check the L wire and it doesn't have any cracks or holes
I don't know what to do next.
My 2.5L is throwing a check engine light with only 5000ish miles?!
P2407 - Powertrain - Auxiliary Emission Controls - "Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic"
I did a quick google search and apparently it MAY be due to a loose gas filler cap. I tightened it and drove around the block. Still on...
And (from the google search), this code isn't common with VWs.. (in fact, couldn't find a single VW with this code?).
Have a pretty good running (I think), 2000 7.3 with 151K that has always been pretty noisy. Lots of clatter. I amjust wondering if there's an easy way to tell if I may have injector issues starting to come up.
View 8 RepliesI have been trying to hunt down the issue with my 4wd. I have thus far done the following:
- Check and clean all fuses under dash
- Checked the underhood relays
- Check for proper operation at switch
- Opened relays under how and manually switch them, transfer case motor and lights on dash work as they should.
So my though is that I have power going everywhere. Something is not sending the signal to the relays. I would narrow this down to the 4wd control module behind the glove box. Is there any way to test this for sure? I'm about ready to just buy on and slap it in. Spending way too much time on this issue.
My 2007 Passat Wagon has a weird problem. Sometimes, it failed to start engine. The only signal on the panel is the red battery sign. I need to reinsert the key and try again. It does not happen every time.
View 19 RepliesSo I had an issue with the trans temp sender leaking out of the test port where it's installed. My first clue was a smell of ATF, then a high trans temp, and finally many, many spots on the driveway. Anyway, I discovered that either I lost the o-ring for the sender or it didn't come with one. Regardless, I got an o-ring and its sealed for the most part. There is still a drop or two under the truck after it has been running. How can I fully get rid of this issue? Would some RTV thread sealer do the trick?
View 3 RepliesI've been getting this error code recently ("Fuel Trim,Bank1 System too Lean"). I have a Scanguage, which let me get the error code, and I used it to reset the message - it came back about a week later. I took it to a local repair shop after the second time, but as I'd already cleared the message, he couldn't do anything. It came back about a week later, and this time I took the vehicle in as soon as the yellow light showed up (without connecting the Scanguage).
The mechanic said that he found both P0171 and P0172, and that the problem was a loose vacuum hose AND a failing Mass Airlow Sensor. They reattached the hose and cleaned the sensor, but said that the latter fix may not last - the light came back on two days later. I took it in again (this time, checking the codes, and found only P0171) and he said this confirms the problem with the sensor and he'll have to replace it ($280 for the part, plus labor, less a discount on the labor equivalent to the labor he put in to clean the sensor.)