Powertrain, generic (extended)

P22F8 Cylinder 8 Alternative Fuel Injector Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Functional code for the cylinder 8 gas injector circuit, meant for cases where wiring is intact but the valve reacts outside the expected window. No manufacturer documents this code publicly. Both at Ford (2014 list) and at Altech-Eco/TransEco the series stops at P22F6/P22F7 for this cylinder. The reference is therefore CARB, which asks for a check of proper functional response of output components and lets the maker define when it runs. Plausible triggers would be a valve that opens late or not fully, contamination from the gas supply, or a heat-soaked coil at the rear of the engine. Unlike the circuit codes, the fault may show only under certain loads, so a confirmation drive is usually needed after repair.

Likely causes

Cylinder 8 gas valve opening late or partly due to contamination
Coil degraded by heat at the rear of the engine
Contact resistance in the injector plug

Symptoms

  • Hesitation under load in gas mode
  • Cylinder 8 misfire code possible
  • Check engine light possible

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–800
Time0.5–3 h

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

Parts involved

alternative fuel injector

Related codes

P22F5P22F6P22F7P22F4P0308

References: law.cornell.edu, http:, performanceparts.ford.com.