P208FReductant Injection Valve Stuck Closed (Bank 2 Unit 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- MIL and DEF or SCR warning
- Higher NOx on one exhaust branch
- Possible derate or countdown to no-restart
- Likely causes
- LikelyUrea crystals blocking the Bank 2 dosing valve
- PossibleValve needle stuck from deposits or overheating
- RareRestricted supply line to the second valve
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.