2001 Vw Jetta Idle Air Control Valve Location

Will a bad idle air control valve throw a code?

In most cases, cars built after 1996 with onboard diagnostics (OBD) II will set a code for a bad IAC. Many older cars with OBD I will also set a DTC when there's a problem with the IAC. You can check for diagnostic trouble codes using a scan tool or code reader. via

What sensors affect idle speed?

The computer monitors idle speed by counting ignition pulses from the ignition module in the distributor or crankshaft position sensor when the throttle position sensor or throttle switch signals the computer that the throttle is closed and the engine is at idle. via

Why do my RPMs go up and down while in park?

If the engine can't keep idling, it will continue trying to get it revved up to compensate. The cause of the erratic engine you're experiencing could be a vacuum leak, sensor failure, or an EGR system malfunction. via

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