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P20EE – SCR NOx Catalyst Efficiency Below Threshold – Ford EcoBlue (Ford 2.0 EcoBlue)

Fault code P20EE means "SCR NOx Catalyst Efficiency Below Threshold – Ford EcoBlue". It is common on 2.0 EcoBlue (Transit, Transit Custom, Kuga, Mondeo, Galaxy, S-Max), 1.5 EcoBlue (Focus, Kuga, Puma) engines. Below are the real-world causes, step-by-step tests and OEM part numbers.

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P20EE quick summary

Fault codeP20EE
MeaningSCR NOx Catalyst Efficiency Below Threshold – Ford EcoBlue
SystemPowertrain (Engine & Transmission)
VehiclesFord
Common on2.0 EcoBlue (Transit, Transit Custom, Kuga, Mondeo, Galaxy, S-Max), 1.5 EcoBlue (Focus, Kuga, Puma)
SeverityMedium
Can I drive?Yes, but the car may count down to reduced speed or no restart. Fix it before the limit is reached.
Repair cost€0 – €1,800

Symptoms of P20EE

  • AdBlue or emission warning
  • Countdown message
  • Engine warning light
  • Reduced power
  • White crystals at the AdBlue injector

Most common causes of P20EE (most likely first)

Mechanic's Pro Tip

On EcoBlue Transits the AdBlue injector, the tank module (pump/heater) and NOx sensors are known failure points. Check AdBlue quality and look for crystals at the injector first. FORScan can run the dosing test and read the NOx sensor values.

  1. 1.Poor-quality or old AdBlue

    Most likely

  2. 2.Crystallised or clogged AdBlue injector

  3. 3.Faulty AdBlue tank module (pump/heater)

  4. 4.Faulty NOx sensor

  5. 5.Aged SCR catalyst

Step-by-step diagnostic guide

  1. 1

    Read codes and countdown status with FORScan or IDS.

  2. 2

    Check AdBlue quality.

  3. 3

    Inspect the injector and run a dosing test.

  4. 4

    Check the NOx sensors upstream and downstream of the SCR.

  5. 5

    Repair, clear codes and complete a test drive.

How do I read fault codes? →Where the OBD2 port is, which scanner to use and how to read and clear codes step by step.

Frequently asked questions

Is the EcoBlue AdBlue tank a known problem?

Yes, the AdBlue tank module with pump and heater has been a common repair on Transits.

Does the EcoBlue also have a wet belt?

Yes, the 2.0 EcoBlue uses a timing belt in oil for the oil pump drive; use the correct oil and check it at service.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.