OBD Guide
ENFRDEESPT

P1605

Engine Rough Idling

P1605 is an OBD-II diagnostic trouble code meaning: Engine Rough Idling. Common causes: throttle valve contamination, throttle position sensor malfunction. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can 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

  1. Check and clean the throttle valve
  2. Check the operation of the throttle position sensor
  3. Inspect the idle air control
  4. Check the system for vacuum leaks
  5. Diagnose the ignition system

Related codes

P0505P0506P0507

Error P1605 by Vehicle Brand

BuickCadillacChevroletFordGMGMCJaguarLexusLincolnMazdaMercuryNissanOldsmobileSaturnToyotaVolkswagen

FAQ

What does the P1605 code mean?

P1605 is an OBD-II diagnostic trouble code that indicates: Engine Rough Idling

What causes a P1605 error code?

The most common causes of P1605 include: Throttle valve contamination; Throttle Position Sensor Malfunction; Problems with idle air control; Vacuum leaks.

How do I fix a P1605 diagnostic trouble code?

To fix P1605: Check and clean the throttle valve. Check the operation of the throttle position sensor. Inspect the idle air control. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1605?

Yes, but get it checked soon

How much does it cost to fix P1605?

The estimated repair cost for P1605 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat