P0067 Air Assisted Injector Control Circuit High

Air-assisted injectors have an air sleeve around the nozzle tip: air flowing past at high speed breaks the fuel spray into finer droplets, which improves combustion and cold starts and lowers hydrocarbon emissions. On port-injected engines this air is taken upstream of the throttle and dosed by a pulse-width modulated bypass solenoid; because it bypasses the throttle, it is part of the idle air. The system is rare and mainly found on older engines. P0067 reports too high a voltage in the control circuit of the air-assist solenoid, typically a short to battery voltage.

Likely causes

Symptoms

• Check engine light on
• Unstable idle
• Poorer cold starting

Repair estimate

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

Parts involved

Related codes

References: law.cornell.edu, patents.google.com, patents.google.com.