Powertrain, generic (extended)

P252F Engine Oil Level Too High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P252F is not a wiring fault: the level sensor works and reports more oil in the sump than the permitted maximum. Deutz's EMR controller files the condition as P252F-00 under oil level parameter SPN 98 with FMI 15, and Ford's 2014 BOSS 302S code table lists P252F without a lamp entry. Besides overfilling at a service, fuel getting into the oil is a common reason. Mazda's Service Alert SA-026/18 for several 2013–2019 models explains that frequent short trips leave direct-injected fuel in the crankcase, raising the level; on a later long drive the fuel evaporates and can richen the mixture enough to set P0172. Coolant entering the oil also adds volume. Sensors that measure continuously while running, such as Hella's ultrasonic type, can catch this early. Low level is P250F. Check the dipstick and oil smell.

Likely causes

Too much oil added at the last oil change or top-up
Fuel dilution from frequent short trips or diesel particulate filter regeneration
Coolant entering the oil (head gasket, oil cooler)

Symptoms

  • Oil level warning in the instrument cluster
  • Dipstick reading above the maximum mark, oil may smell of fuel
  • Possible rich mixture codes after long drives

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–2,000
Time0.2–8 h

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

Parts involved

engine oiloil level sensor

Related codes

P250FP250AP0172P253F

References: serdia.deutz.com, performanceparts.ford.com, static.nhtsa.gov, hella.com.