OBD Guide
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P1312

Ignition Coil Knock Detection Cylinder 1 & 2

P1312 is an OBD-II diagnostic trouble code meaning: Ignition Coil Knock Detection Cylinder 1 & 2. Common causes: poor quality fuel with low octane number, faulty spark plugs. Estimated repair cost: $17–89.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–89 (est.)

Symptoms

  • Engine knocking or ringing
  • Power Loss
  • Unstable engine operation
  • Increased fuel consumption
  • Check Engine light comes on

Causes

  • Poor quality fuel with low octane number
  • Faulty spark plugs
  • Problems with ignition coils
  • Faulty knock sensor
  • Mechanical engine problems (for example, carbon deposits in the combustion chamber)

How to Fix

  1. Check fuel quality and replace if necessary
  2. Check and replace spark plugs
  3. Check ignition coils
  4. Check the knock sensor and its wiring
  5. Diagnose the engine for mechanical problems

Related codes

P0325P0326P0327

Error P1312 by Vehicle Brand

MazdaSubaru

FAQ

What does the P1312 code mean?

P1312 is an OBD-II diagnostic trouble code that indicates: Ignition Coil Knock Detection Cylinder 1 & 2

What causes a P1312 error code?

The most common causes of P1312 include: Poor quality fuel with low octane number; Faulty spark plugs; Problems with ignition coils; Faulty knock sensor.

How do I fix a P1312 diagnostic trouble code?

To fix P1312: Check fuel quality and replace if necessary. Check and replace spark plugs. Check ignition coils. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1312?

Do not drive — repair immediately

How much does it cost to fix P1312?

The estimated repair cost for P1312 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat