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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…
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Top 5 AdBlue Fault Codes Across Peugeot, Citroën and Ford Vans
Modern Peugeot, Citroën and Ford vans often suffer from recurring AdBlue fault codes. While these codes look confusing on a scan tool, they all point to common problems inside the SCR system. Here’s a breakdown of the top five we see in 2025, what they mean, and how they’re fixed…