Question about 2003 Volkswagen Jetta TDI
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Posted on Jan 02, 2017
SOURCE: 1999 vw jetta 2.0
Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.
First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.
Posted on Sep 02, 2008
Clean the EGR valve seat. The EGR may have become stuck. A good way to check for vacuum leaks is to use smoke near every intake vacuun hose . And near the intake manifold. The valve will **** in the smoke. If you clean the EGR valve and it still misses. Replace it. The EGR can cause random misfire.
Posted on Jan 06, 2010
Testimonial: "ok ill give that a try i never herd the smoke test before but i like it sounds like it will work"
Low fuel pressure will cause many of those codes to set.
Should have around 3.5bar pressure at idle and full throttle.
Check to see if VW has a recall on the ignition coils. They are cheap to replace however.....you will need your VIN# when you call.
Alternator problems can also trip codes . Check for a/c ripple at BATT + on Alternator...no more the 0.05vac allowed.
Valve train noise common complaint. ...often due to lack of oil services and/or incorrect oil type.
All 1.8T engine will clatter on start up one time or another and is considered normal as long as it goes quiet after 2 to 5 seconds at idle.
You should have synthetic oil in the engine.
P0012 is often timing incorrect. ...check timing belt at tdc.
These engines need a timing belt every 50,000 miles not the 100,000 miles VW suggests. Belt failure is catastrophic.
Transmission codes often corrosion in loom connections under battery. These need checked and cleaned with a solution of STABILANT22A applied to the pins.
If a scanner is available clear the codes and drive for 40 miles or so and recheck for codes. Transmission codes are not always due to transmission faults. They need 200 miles to re adapt after batter replacement or power off.
ROSS TECH site has lots of info' and a scanner program for your lap top.
Posted on Jan 13, 2011
Testimonial: "Great information. Thanks."
SOURCE: Hello i have a GTI
I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.
Posted on Feb 06, 2011
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