Tag: Citroën AdBlue

Citroën & Vauxhall AdBlue Faults: P20E9, U029D & Other Codes

Citroën and Vauxhall vans are some of the most common we attend for AdBlue-related faults. Codes like P20E9 (reductant pressure too high) and U029D (lost communication with the NOx sensor) can put a van into limp mode or start a no-start countdown at the worst time. Here’s a clear guide…