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Volkswagen OBD II Failed Inspection because of dtc's!


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Last Post: Jul 24, 2006 3:14 PM Last Post By: ajohn
MarkSW

Posts: 1
Registered: 07/31/05
Failed Inspection because of dtc's!
Posted: Jul 31, 2005 4:04 PM
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Took my 2002 Jetta GLS (4 cylinder, 2.0 liter, manual, 97,000 miles)to PEP Boys for annual inspection. My engine light was on so I expected trouble. The technician phoned me and of course I did not pass. They told me that the car could not be inspected with the engine light on. They ran the codes and the following showed up:

P0420 (Catalyst System, Bank 1, Effeciency Below Threshhold), P0116 (Engine Coolant Temperature Circuit Range/Performance), P1296 (Coolant System Malfunction), P0351 (Ignition Coil A, Cylinder 1, Primary/Secondary Circuit Malfunction).

The car runs great. I've done nothing to the car except preventative maintenance (oil, oil filter, air filter, breaks, tires). Coolant level is fine as are the rest of the fluids.

PEP Boys bowed out and told me that I need to take the car to Volkswagen as these codes make repairs IMPOSSIBLE for them.

Is there anything I can do (new coil, new engine coolant sensor, etc) that will solve these DTC's? And does the fact that these codes appear mean that there is REALLY a problem?

Any help is appreciated.

melk

Posts: 303
Registered: 05/03/04
Re: Failed Inspection because of dtc's!
Posted: Jul 31, 2005 6:22 PM   in response to: MarkSW in response to: MarkSW
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The P0116 & P1296 could both because of a faulty Engine Coolant Temperature sensor, which doesn't cost too much. Not positive, but it might also be from a bad thermostat. Have you had that changed recently by chance?

The P0420 could be a bad catalytic converter ($$$) or a bad post-O2 sensor. Their replacement interval is usually 100,000 miles, so that'd be somewhere to check.

If you're not too big on doing work yourself, I'd take your car in to an independent VW mechanic and have them fix. Also, you might try posting in the Jetta forum for more responses.
bobengine

Posts: 182
Registered: 05/19/04
Re: Failed Inspection because of dtc's!
Posted: Aug 1, 2005 12:43 AM   in response to: MarkSW in response to: MarkSW
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If your in the usa, that is a free fix.
Fed law dealers fix emission related problems, free up to I think 104,000 miles. Not sure of that but I know it is over 100 k miles. Check into it before spending the $.
melk

Posts: 303
Registered: 05/03/04
Re: Failed Inspection because of dtc's!
Posted: Aug 1, 2005 10:29 PM   in response to: bobengine in response to: bobengine
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Not necessarily. According to the EPA, for 1995 and newer model year vehicles, emission control and emission related parts are warranted for the first 2 years or 24,000 miles of vehicle use. Specified major emission-control components are warranted for the first 8 years or 80,000 miles of vehicle use. Parts with a stated replacement interval, such as, "replace at 15,000 miles or 12 months," are warranted up to the first replacement point only. As far as the CC, it'd be to the 80K. There are some differences by state also.

Message was edited by: melk

dannyc

Posts: 2
Registered: 05/23/06
Re: Failed Inspection because of dtc's!
Posted: May 23, 2006 11:56 AM   in response to: bobengine in response to: bobengine
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My 2000 Passat check engine light keeps coming on after spending hundreds of dollars replacing plugs, air filter, and O2 sensors, (Dealer recommendations), and private mechanics. The red letters in the middle of the instrument panel beeps and says "Emissions Workshop" The same code keeps coming on- P1128 (Fuel air mixture too lean). The car runs great but I just bought it and can't get it E-checked until I can get the Check engine light off! Is it the Mass Air Flow sensor and if so can I clean it to pass the e-check? The car only has 77,000 miles on it! HELP !
SICVIC

Posts: 1
Registered: 06/24/06
Re: Failed Inspection because of dtc's!
Posted: Jun 24, 2006 7:55 PM   in response to: dannyc in response to: dannyc
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if you have a washable air filter, the oil applied to the media (in excess) can cause a problem with the MAF. coating it and causing it to produce a different voltage signal by not being in direct contact with the air. try cleaning it with intake cleaner and letting it to air dry. also it may be caused by poor fuel pressure.
ajohn

Posts: 1
Registered: 07/24/06
Re: Failed Inspection because of dtc's!
Posted: Jul 24, 2006 3:14 PM   in response to: SICVIC in response to: SICVIC
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You are absolutely right. It is causing by the filter. I bought my VW passat in 2000. The engine light started coming since it reached 70,000 miles. I took it to the dealer so many times. They ran som etest an dsaid engine is mis firing , the catilitic converters are bad and gave me ab estimat for $3500 dollars. Every time they change the sensors or reset the computer and make me pay fopr it. Before it hit 100 miles engine light comes back again. I took it to a VW local mechanic he fixed the problem. The air filter was replaced . I am very happy now. I believe some of these delears are a ripp off after the warranty period expires.

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