Question about 2003 Volkswagen Jetta TDI
O2 sensor as in lambda sensor in the exhaust you can only get 4 or 5 pin and I would imagine it been a 4 pin as its pre cat . I would buy a OE one
Posted on Jan 11, 2013
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Posted on Jan 02, 2017
Yes it is that easy. It should be a 4 pin connector located on the transmission side of the engine head in a plastic flange. Best is to wait for the engine to be cold. Unscew the radiator cap to relieve pressure but screw it right back on. On the 2.0L engines when you unclip the coolant sensor little or not coolant loss will happen if you do this. Just unplug it, pull out the clip, pull out the sensor, and the seal which sometimes stays stuck. Install the new sensor with a new seal lubricated with some coolant, make sure it's well seated and reinstall the clip. The sensor is well seated if the clip fits right over the top, just make sure both sides clipped into position. Replug it fill the coolant with VW original coolant mixed 50-50 with water if needed and done. If you have a fault you might need a scanner to erase the check engine or fault in the cluster.
What's the reason for changing it? Eratic temperature readings?
Posted on Nov 29, 2008
SOURCE: I have a 2003 VW jetta tdi
You've lost engine coolant somewhere, and need to fill the engine back up with the VW special G12 coolant.
Then find the leak, which will be in one or more of the following places -
Water hoses to heater core, including any other coolant carrying hoses in the engine compartment
Plastic manifold bolted to side of engine which is known to leak (have replaced on an '01 VW Beetle, and an '02 Jetta, both members of our family in the past few years.).
Overflow reservoir cracked
Reply back what you find. If the engine got too hot, you may need to have the thermostat replaced.
Posted on Feb 03, 2009
SOURCE: 02 Jetta 2.0 Check Engine Light
Hi, only way to really know what the check engine light is for is to run a diagnostic check on the pcm using a OBD II diagnostics tool, you can buy one at most auto parts store's or if you don't want to spend the money on one some auto parts store's will do a diagnostics check on your vehicle for free, good luck.
Posted on Mar 29, 2009
SOURCE: 2006 Jetta TDI Electrical!!!
There is a known issue with the wiring harness in the doors. It's possible that the passenger door also has a bad harness (assuming they swapped out the one in the driver's door) Is that a correct assumption? It may still be related to your original problem too. I've heard of disconnecting the battery for 20 minutes to reset the electrical (door switches). You should def give that a try - it's free.
Also check out the forums at www.tdiclub.com - those guys know their VW TDI's...
Posted on Jul 13, 2009
Testimonial: "The battery disconnect did not work but I am glad to hear it's not just me."
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