Originally Posted by Lindaak
Due to a fuel tanker truck accidentally dropping diesel in the premium tank at a gas station, I unknowingly filled my almost empty VW Passat with the contaminated fuel. According to my dealer, the oxygen sensors and catalytic converters had to be replaced.
This could be correct, but I don't have enough info to evaluate for sure. Did you drive the car after the fill up? When it started to misfire/run rough did you stop right away, or did you continue to try and drive until the car would not go any further? A misfiring engine can destroy a cat in almost no time. This is why converter are monitored in OBDII cars. BTW what year Passat are we talking about?
The fuel transport company insists the fuel and emissions systems are not connected. Therefore, they only want to reimburse for the fuel and fuel tank flush. Thoughts?
This is like saying that your arm is not connected to you leg, and an infection in one could not cause a problem in the other. In other words total BS. Of course they do not want to spend any money they don't have to, but the damage is their fault.
Over the years I have dealt with many mis-fuelling problems (Gas in diesel tank, water in gas tank, and diesel in gas tanks) I have had to drop tanks, to remove ALL
the water, change fuel filters, replace injectors, fuel distributors, and flush the lines. I have never had to change O2 sensors or cats, but emission standards are much tighter now, and systems are less tolerant such things.
Assuming that you have a late model (OBDII) VW, I would expect as a minimum you will have to have the tank flushed, fuel filter(s) replaced, and new fuel installed. Codes cleared and a test drive.
If the fuel company balks at the new converter, then tell them that they will have to pay for a technician to test drive the car and set the readiness byte to prove that that there is no damage to any of the other downstream systems (converter, O2 sensors etc) If the technician can set the readiness byte that means that all systems have been tested and report that all is OK. If the readiness byte won't set, then something is not right.
If I can answer any further questions, feel free to ask.