Powertrain, generic (extended)

P207F Reductant Quality Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P207F is the verdict that the tank holds something other than proper DEF, which CARB explicitly requires the OBD system to detect. Without a quality sensor the fluid is judged by its effect: GM's 2011 diesel table names the code Incorrect Reductant Composition and compares measured SCR NOx conversion with a limit that depends on temperature and flow, Type B; Volkswagen's 2014 Touareg TDI flags average efficiency below 0.50. GM PIP5007D adds that its Exhaust Fluid Quality Poor message on 6.6L LGH/LML trucks only reports lost conversion, not necessarily bad fluid. With a sensor the verdict is direct: Deutz files poor AdBlue as P207F-00 and a wrong fluid type as P207F-29. Ford SSM 46706, Nissan NTB17-060 (Titan XD 5.0L Cummins) and Hino SB-14-028 updated tests or software. Pure catalyst ageing belongs to P20EE.

Likely causes

Water, coolant or other fluid in the DEF tank

Old DEF degraded by heat or long storage

NOx sensor reading wrong, faking poor conversion

Partly blocked dosing valve delivering too little fluid

Symptoms

Exhaust fluid quality warning in the cluster
MIL and countdown to speed limit or no-restart
Message persists until a quality test or relearn is passed

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–1,500

Time0.5–4 h

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

Parts involved

reductant tankreductant quality sensornox sensorscr catalyst

Related codes

P206A P206B P206C P206D P20EE P2BA9

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.