Powertrain, generic (extended)

P2698 Exhaust Aftertreatment Fuel Injector A Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2698 is not about wiring but about whether the exhaust fuel doser does what it is told; most often the check looks for leakage when no dosing is requested. Ford's 3.2 L Transit (2017 and 2018 summaries) compares a measured temperature downstream of the injection point with a model after at least 6 h engine-off. The 2023 6.7 L Super Duty uses a model check after 21,600 s soak plus a second logic that balances oxygen mass before and after the catalyst. Volvo and Mack article KC-90 (model years 2016–17) warns the code can appear without symptoms and points to exhaust sensors, a low-flow nozzle, the AHI module and the catalyst; Mack bulletin GDC19-014 (US19) first updates engine software. Ram also lists P2698 in a 2026 PCM flash for 6.7 L Cummins chassis cabs.

Likely causes

Doser valve or nozzle leaking fuel into the exhaust
Coked nozzle or line causing low flow
Exhaust temperature sensor drifting and skewing the model comparison
Engine software needing the manufacturer update

Symptoms

  • MIL on, often without noticeable drivability change
  • Regenerations fail or take unusually long
  • Higher fuel use or white exhaust smoke

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

hc dosing injectorexhaust gas temperature sensordiesel oxidation catalyst

Related codes

P2697P2699P269AP24A0P24F6

References: fordservicecontent.com, fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.