NOx Sensor Faults
NOx sensor faults can trigger AdBlue warnings, emissions faults and SCR efficiency codes. We compare fault codes with live data before recommending replacement.
AdBlue diagnostics Cardiff
AdBlue countdown, NOx sensor and SCR faults diagnosed properly.
AdBlue problems can stop a diesel from starting once the countdown reaches zero. We check the cause before parts are changed, from NOx sensor data and SCR efficiency to pump pressure, injector dosing, tank heaters and fluid quality.
AdBlue Countdown
Many vehicles display a mileage countdown before restart is blocked. Do not ignore it; the underlying fault may be pump pressure, level sensing, quality, dosing or SCR performance.
Injector and Pump Issues
Crystallised AdBlue, injector faults, blocked lines and pressure problems can all stop the SCR system dosing correctly.
SCR System Diagnosis
SCR faults often need live data, code history and sensor checks. Guessing can get expensive quickly, especially when NOx sensors and tank modules are involved.
Common AdBlue Fault Codes
These are common generic AdBlue, SCR and NOx sensor codes. Some manufacturers use extra codes and descriptions, so we always confirm the diagnosis with live data and system tests.
AdBlue Pressure, Pump and Injector Codes
P20E8Reductant pressure too low.
P20E9Reductant pressure too high.
P208AReductant pump control circuit open.
P208BReductant pump control range or performance.
P208CReductant pump control circuit low.
P208DReductant pump control circuit high.
P2047Reductant injector circuit open.
P2048Reductant injector circuit low.
P2049Reductant injector circuit high.
NOx Sensor and SCR Efficiency Codes
P20EESCR NOx catalyst efficiency below threshold.
P204FReductant system performance fault.
P207FReductant quality performance fault.
P2200NOx sensor circuit bank 1.
P2201NOx sensor range or performance bank 1.
P2202NOx sensor circuit low bank 1.
P2203NOx sensor circuit high bank 1.
P229FNOx sensor 2 range or performance fault.
P2BAENOx exceedance or emissions-related manufacturer strategy fault on some vehicles.
Tank, Heater, Level and Quality Codes
P202AReductant tank heater control circuit.
P202BReductant tank heater control circuit low.
P202CReductant tank heater control circuit high.
P203AReductant level sensor circuit.
P203BReductant level sensor range or performance.
P203CReductant level sensor circuit low.
P203DReductant level sensor circuit high.
P203EReductant level sensor intermittent or erratic.
P205BReductant tank temperature sensor range or performance.
AdBlue Removal Disclaimer
AdBlue, SCR, DPF and EGR removal work is only for off-road, export, motorsport or non-road vehicles. It is not supplied for vehicles used on UK public roads, and we make no promise that a vehicle will pass an MOT after removal work.
Speak to Cardiff DPFAsk About An AdBlue Fault
Send your vehicle make, model, year, engine size, fault codes and a photo of the AdBlue warning or countdown. We will point you toward the right diagnostic route.
Call now02922 130155Contact Cardiff DPF by telephone on 02922 130155.