P20EE on Land Rover
SCR NOx Catalyst Efficiency Below Threshold
P20EE on Land Rover vehicles indicates scr nox catalyst efficiency below threshold. Au7o has documented this code across 1 Land Rover model — most commonly on Range Rover Velar. This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. Typical repair costs on Land Rover range from $500 to $2,000, depending on the specific model and root cause.
Common Causes of P20EE
- •Poor quality, contaminated, or wrong DEF fluid
- •Faulty or clogged DEF injector/dosing valve
- •Failed upstream or downstream NOx sensor
- •Degraded or failed SCR catalyst
- •Exhaust gas temperature sensor fault affecting dosing
- •Exhaust or DEF line leak
- •DEF line/heater problems (crystallization or freezing)
P20EE on Land Rover by Model
Land Rover Range Rover Velar(1 issue)
- AdBlue/DEF System Faults and Injector Crystallization2018-2024
The diesel Velar models are prone to AdBlue (DEF) system faults caused by the AdBlue injector crystallizing. Crystallized AdBlue blocks the injector and prevents proper urea injection into the exhaust, triggering a countdown to engine restart lockout. The AdBlue heater and level sensor also fail, giving false empty readings even with a full tank.
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View P20EE across all makes →Frequently Asked Questions
What does P20EE mean on Land Rover?▼
P20EE stands for "SCR NOx Catalyst Efficiency Below Threshold." This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. On Land Rover specifically, this code is documented across 1 model.
What causes P20EE on Land Rover vehicles?▼
Common causes on Land Rover: Poor quality, contaminated, or wrong DEF fluid, Faulty or clogged DEF injector/dosing valve, Failed upstream or downstream NOx sensor, Degraded or failed SCR catalyst, Exhaust gas temperature sensor fault affecting dosing. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P20EE on a Land Rover?▼
Repair costs on Land Rover range from $500 to $2,000, depending on the specific model and root cause.
Which Land Rover models have P20EE documented?▼
Au7o has documented P20EE on 1 Land Rover model: Range Rover Velar.