P00F9 Turbocharger Outlet Pressure Sensor A Range/Performance

The turbocharger outlet pressure sensor A measures the pressure directly at the compressor outlet. It is a separate code family from the boost pressure sensor, which usually measures the pressure just ahead of the throttle; engines use it where the pressure behind the compressor is needed in addition, for example to judge the pressure loss across the charge air cooler or to protect against compressor surge. One manufacturer documents it as a combined temperature and pressure sensor. P00F9 means the signal is electrically valid but implausible. In a documented case the cause was a sensor not seated properly and a connector not fully engaged; securing them solved it without parts.

Likely causes

Symptoms

• Check engine light on
• Loss of power or limp mode with boost limitation
• Jerking under load possible

Repair estimate

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

Parts involved

Related codes

References: law.cornell.edu, static.nhtsa.gov, newtonnet.co.uk.