AdBlue Pressure Sensor vs Pump Fault: How to Tell the Difference
U-code diagnostics • NOx comms loss • SCR warnings U029D Fault Code: NOx Sensor Communication Lost (Meaning, Causes, Fix Steps) U029D is not “a bad reading”. It’s a lost conversation between modules. Fixing the comms issue often stops the repeat AdBlue warnings. Call 07349 821 999 Book a mobile visit Mobile across Leicester, Loughborough & […]
P20E8 Code: AdBlue Low Pressure — Causes, Diagnosis & Fix
Seeing P20E8 on your dash or scan tool? That code means the AdBlue (DEF) system can’t build enough pressure. Below we explain what causes low pressure, how we diagnose it on your drive, and the quickest way to fix it. What P20E8 actually means P20E8 is “Reductant Pressure Too Low.” In plain English: the SCR […]
P20EE00: SCR NOx Efficiency Fault — Why It Triggers & What to Do
Fault code P20EE00 means the SCR catalyst isn’t reducing NOx as expected. It’s one of the most common AdBlue-related errors across vans, especially Mercedes, Ford, and VW models. Here’s what it means, how we diagnose it, and how to clear it for good. What the P20EE00 code means P20EE00 translates to “SCR NOx Catalyst Efficiency […]
P204F Fault: AdBlue System Performance Issues & Mobile Fixes
The P204F fault code appears when the ECU detects poor performance in the AdBlue system. It’s a general warning that something in the SCR process isn’t working — from pressure and dosing to temperature or sensor feedback. Here’s what causes it and how we fix it on-site. What does P204F mean? The full description of […]