Powertrain, generic (extended)

P208F Reductant Injection Valve Stuck Closed (Bank 2 Unit 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P208F is the Bank 2 version of P208E: the first dosing valve on the second exhaust branch fails to open although its drive circuit is in order. It only applies to engines with two separate SCR branches, each with its own dosing valve, which is rare; most diesel cars and trucks run one valve on Bank 1. No manufacturer documents P208F publicly. The Bank 1 logic shows how the check works: Ford's 2023 diesels judge the valve stroke by stroke and need 50 failed strokes, the 2014 VW Touareg TDI needs over 50 absent current peaks. Ford pauses the test during circuit faults; for Bank 2 those would be P2050 to P2052. Crystallised urea in the nozzle is the most likely cause. CARB requires a reductant delivery fault to be detected. The second branch then receives no fluid, NOx rises and inducement may begin.

Likely causes

Urea crystals blocking the Bank 2 dosing valve
Valve needle stuck from deposits or overheating
Restricted supply line to the second valve

Symptoms

  • MIL and DEF or SCR warning
  • Higher NOx on one exhaust branch
  • Possible derate or countdown to no-restart

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant injection valve

Related codes

P208EP2050P2051P2052

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.