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Audi A4 Adblue/DEF Error: fault. No Restart in 650 mi.

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December 30, 20232 yr

Hi,

Got a B9 Audi displaying this error along with Engine Management Light staying on.

Tank is full and I had no previous Adblue Warnings about topping up.

Drove the car, Error goes away, then comes back a little later, but the Engine Management Light remains off. If the EML is off, then the Adblue Error stays on. In other words one warning remains.

The 650 Miles counts down so when down to 600 miles but when I park up, it reverts back to 650 miles.

This makes me think this is software error but if it's not, would the error disappear and then come back.

Took to local mechanic and these errors are coming up:

First time it was scanned I got

P20E800: Reductant Pressure too Low

P2BAF00: NOx System Driver Inducement

Second time it was scanned I got:

P20E800: Reductant Pressure too Low

P208D00: Reductant Pump "A" Control Circuit High

P20C400: Reductant Pump "C" Control Circuit High

P2BAF00: NOx System Driver Inducement

They recommended replace everything including ECU. Just looking for advice.

December 30, 20232 yr

Hello and welcome Michael,

To try to reply to you ASAP, try a search on here for Ablue.

Kind regards,

Gareth.

December 30, 20232 yr

Known fault often with the adblue sensor/float.

December 30, 20232 yr

Author

some have said an software update fixed this. How do i know what the latest software version is?

52 minutes ago, Steve Q said:

Known fault often with the adblue sensor/float.

December 30, 20232 yr

2 minutes ago, Imaam said:

some have said an software update fixed this. How do i know what the latest software version is?

Might be worth speaking to Audi about the software update

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Welcome to the Audi Owners' Club - An Independent community!

Audi A4 Adblue/DEF Error: fault. No Restart in 650 mi.

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Are S5's notorious for not being serviced?

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