OBD Guide
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P13AF

Knock Sensor Electrical Signal Input A Short Circuit To Positive

P13AF is an OBD-II diagnostic trouble code meaning: Knock Sensor Electrical Signal Input A Short Circuit To Positive. Common causes: damage to knock sensor wiring, short circuit in wiring harness. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption
  • The engine is unstable
  • Detonation knocks during acceleration

Causes

  • Damage to knock sensor wiring
  • Short circuit in wiring harness
  • Malfunction of the knock sensor itself
  • Problems with contacts in connectors
  • Damage to the engine ECU

How to Fix

  1. Check the integrity of the knock sensor wiring
  2. Inspect the sensor connectors for oxidation or damage.
  3. Check the resistance of the knock sensor
  4. Replace knock sensor if necessary
  5. Check and replace wiring harness if necessary

Related codes

P0325P0326P0327

FAQ

What does the P13AF code mean?

P13AF is an OBD-II diagnostic trouble code that indicates: Knock Sensor Electrical Signal Input A Short Circuit To Positive

What causes a P13AF error code?

The most common causes of P13AF include: Damage to knock sensor wiring; Short circuit in wiring harness; Malfunction of the knock sensor itself; Problems with contacts in connectors.

How do I fix a P13AF diagnostic trouble code?

To fix P13AF: Check the integrity of the knock sensor wiring. Inspect the sensor connectors for oxidation or damage.. Check the resistance of the knock sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P13AF?

Yes, but get it checked soon

How much does it cost to fix P13AF?

The estimated repair cost for P13AF is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat