P1605
Engine Rough Idling
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)
Symptoms
- Engine idles rough
- Floating speed
- Vibrations at idle
- RPM dips
- Possible difficulty starting
Causes
- Throttle valve contamination
- Throttle Position Sensor Malfunction
- Problems with idle air control
- Vacuum leaks
- Ignition system malfunctions
How to Fix
- Check and clean the throttle valve
- Check the operation of the throttle position sensor
- Inspect the idle air control
- Check the system for vacuum leaks
- Diagnose the ignition system