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alan
alan 1/5/2013
2002 Volkswagen Passat GLX 6Cyl2.8L - Engine
My check engine light came on code P2098. O2 senser on bank 2. Was on for a week then suddenly disappeared.
What gives? Why did check engine light suddenly disappear? Car has 134K on it. Brought it to a garage today. They said the catalytic converters seemed fine. Wanted to move O2 sensors from front of catalytic convertvers to behind them. Said it fixed problem on 90% of VW's. As soon as I left garage check engine light went off. Car seems fine. Any idea why light would come on for a week then go off?
I'm not sure whether I should get O2 sensors moved. Your thoughts?
2 Answers
  • Jimm
    Jimm 1/5/2013
    P2098 = Generic Post Catalyst Fuel Trim System Too Lean Bank 2

    Could be a stuck lean rear O2 sensor. This sensor is to check catalyst efficiency, sounds like the sensor could be bad. Recommend to replace the O2 sensors.

    There are already four (4) oxygen sensors on the 2.8L V-6 engine; two each side of the exhust; one sensor each upstream and downstream of the catalytic converter. Find a different dealership or repair shop.

    Try the many on-line auto parts sources, such as; www.autopartswarehouse.com or www.rockauto.com for the replacement parts.
    They (Rock Auto) list the O2 sensors from around $43.00 each for your vehicle.
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  • Walker Pro
    Walker Pro 5/7/2013
    Hello Alan,

    Since your vehicle has 134k miles on it, moving the sensors may have delayed the inevitable for a short time. It is likely you will need to replace all of the sensors soon. Replacing them now may prevent catalytic converter damage as well. We are not sure how they were able to swap the sensors since the front sensors are 610mm long and the rear sensors are 1690mm long. If they cut and spliced the wires to accomplish this swap it is likely you will have problems with the connections soon. Your vehicle is equipped with 4 sensors (2 upstream & 2 downstream).
    The correct Walker number for the upstream sensors is 250-24395
    The correct Walker number for the downstream sensors is 250-24414

    If you have any further questions or concerns please contact us and we will be happy to help.

    Walker Pro (www.walkerproducts.com)
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