Question about 2000 Volkswagen Jetta TDI

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O2 sensors my 2000 jetta has two o2 sensors on it is there any way to tell which one is gone or will i have to take it to a garage

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  • flynn_t Jun 09, 2010

    hey pauldonp
    when my jetta warms up and stops there is no spark untill things cool down it will not go again

  • flynn_t Jun 09, 2010

    sorry meant to say yogegoy


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Easy way is hook up a scanner VAG 1552 or equivalent then see if any DTC (codes) are stored. When it says anything regarding 02 Sensor, then you be ready if you'll need to replace either pre or post.

Posted on May 26, 2010

  • 3 more comments 
  • flynn_t May 26, 2010

    it stopped on me last night and i couldn't get it started again is there any way to get it going without getting a tow truck

  • Ed Paje May 27, 2010

    Difficult to tell since I couldn't assess the problem physically. I'm afraid you have to piggy back her home or to a VW shop

  • Ed Paje Jun 05, 2010

    Although a bad Mass Air Flow (MAF) sensor would put you into Limp Home mode it will still run but at a limited speed (40mph). A bad 02 sensor will still operate with slight rough idle. I'm just guessing a part that will kill operation would be.....

    1. Camshaft Position Sensor

    2. Crankshaft Position Sensor

    3. EPC Electronic Power Control (Accelerator pedal)

    4. Ignition Control Module

    5. Fuel Pump

    6. Fuel Pump relay

    7. All together at the same time: MAF, 02 Sensor, Coolant temp sensor and maybe a Knock sensor

  • Ed Paje Jun 07, 2010

    What is the code? P0???
    If it is reading a P0300 (Multiple Cyl Misfire) the related parts to check are.....

    1. Ignition Coil Pack (Ignition Coil)

    2. Ignition Wire (resistance 4-8ohm)

    3. Spark plug

    4. Knock sensor 1 (G61) resistance: infinite ohm

    5. Knock sensor 2 (G66) resistance: infinite ohm

    6. Camshaft position sensor (G40) mounted on cylinder head behind camshaft sprocket
    Im just guessing it would be #6 although when this goes bad the ignition system will not operate. This part replaced the old distributor. It sends reference points as to when a specific piston reaches the degree when combustion occurs. If it doesn t have this data it will not fire the spark plug. Although it is not part of the ignition system a malfunctioning fuel system could cause problems yet it would still claim it was from problematic ignition system. Put it this way, without fuel, there is nothing to ignite even with all the available spark. The same goes, all fueled up but no matches to strike and light it up. So if the shop replaces all or most of the ignition system and it still does it, they should check the fuel delivery side of the system. Hope this helps.

  • Ed Paje Jun 17, 2010

    In my years of experience working on VW's, this type of problem is caused by a faulty engine temperature sensor (thermo sensor). It's duty is to send internal temperature data to the ECU. With this data, the ECU will determine the correct ratio of air/fuel mixture required to operate the engine. During cold morning start up, the fuel mixture is richer (Choke activated), then gradually corrects the mixture to the lean side when the engine warms up. The 02 sensor acknowledges this before and after it enters the catalytic converter. If the combustion is not withing specs measured by the first (Pre Cat) 02 sensor for pollutants, it will check again while passing through the second 02 sensor (Post Cat). The ECU will use all this data and adjust the fuel mixture depending on engine temperature, outside air temperature and other temperature sensors. So if your sensor malfunctions, the ECU will use incomplete temperature data, not recognizing whether it's a cold start up or a fully warmed up engine.


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1st. of all , how do you know any one of them is bad? The easy way is to use a good scan tool that shows data, not just codes. The harder way is ti hook up dvom with the pos lead on the sensor signal wire [ if there is more than 1 wire, you also need a wiring diagram] and the neg to a CLEAN ground. The front sensor should flucuate between .1 and .9v and the rear between 1 and 5 v.

Posted on May 27, 2010

  • flynn_t Jun 05, 2010

    when it is cold it will start but when it warms up it will shut down i took it to the garage and they put it on a scanner and said both o2 sensors had to be changed and it did the same thing shut down as soon as it got warmed up put it back on the scanner and it came up as distributer problems they changed the coil where there is no distributor on it and it is still doing the same thing but is still showing ditributor when they put it on the scanner


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