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Old 07-29-2010, 03:48 AM   #1 (permalink)
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Default ECS light and "DPF Sensor" issue?

Hi

I have a 2007 4.2TDI and just returned from a 3000 mile round trip to Spain. Whilst down there the Emission Control System(ECS) light came on (the yellow picture of an engine). This stayed on for a while until my first fill up and then went off but returned a while later and stayed on until the return trip where is remains out. This is where I need some help. When I turn the ignition on without starting the engine I’m left with just the seat-belt light and this ECS light which then goes out once I start the engine… is that normal?

Now, returning home I took the Q7 back into Audi so they could reset the adaptive headlamps back to UK driving so I asked them to give me the error code and clear it which they did FOC albeit not happy. The result was:
“Engine Electronics 2 DPF sensor bank 2 implausible signal intermittent”

Note, no other warning lights have come on during this period.

So..
Should the ECS light stay on with the ignition on without starting the engine?
Should I ignore the above error code and wait for the EMC light to come on with the engine
So, should I be worried?

Thanks in advance for any help and advice

A
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Old 07-29-2010, 02:02 PM   #2 (permalink)
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dpf sensor bank 2 possibly defective and requires replacing then reset the ecu values and check ash content in dpf, regenerate dpf if required but continue to drive with a defective sensor could lead to dpf failure and a big repair bill
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Old 07-29-2010, 03:08 PM   #3 (permalink)
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Thanks for that A8. Can you confirm the ECS light remianing on before starting the engine is indicative of a problem, it's not normal? ...the light goes out when the engine is started
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Old 09-08-2010, 05:50 AM   #4 (permalink)
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The light continued to go on/off so I handed it to local Audi and the sensor had failed. £54 to diagnose the problem and £186 to fix.

Thanks for the correct advice A8
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