CUSTOMER CONCERN Check-engine light is on with a cylinder misfire and fuel-injector circuit fault. CAUSE Confirmed failed fuel injector. Injector resistance specification is 11-18 ohms; the confirmed-fix entry did not document a measured value. CORRECTION Remove and replace the failed fuel injector, clear DTCs, and verify the engine runs without a misfire or check-engine light.

CUSTOMER CONCERN The engine misfires with no compression on cylinder 3, no oil registering on the dipstick, cylinder-misfire DTCs and P1286, P128A and P2646. CAUSE Testing confirmed internal engine damage with loss of cylinder compression associated with severe oil consumption. CORRECTION Remove and replace the damaged engine assembly, clear all stored DTCs, and verify compression and normal engine operation.

CUSTOMER CONCERN The engine runs very poorly after air-filter service, pings under load, remains in open loop, and stores lean and misfire DTCs. CAUSE Inspection confirmed debris contamination on the mass-airflow sensor element, causing incorrect airflow measurement and the lean misfire. CORRECTION Clean the mass-airflow sensor element and air-filter housing, clear the DTCs, and verify closed-loop operation and normal engine performance.