OBD Guide
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P1266

Cylinder #6 High To Low Side Short

P1266 is an OBD-II diagnostic trouble code meaning: Cylinder #6 High To Low Side Short. Common causes: damage to the wiring to the injector of the 6th cylinder, fuel injector malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Uneven engine operation
  • Power Loss
  • Increased fuel consumption
  • Check Engine Light Is On
  • Possible misfire in cylinder 6

Causes

  • Damage to the wiring to the injector of the 6th cylinder
  • Fuel injector malfunction
  • Short circuit in wiring harness
  • Problems with the engine control unit
  • Corrosion of contacts or connectors

How to Fix

  1. Check the condition of the wiring to the injector of the 6th cylinder
  2. Check injector resistance
  3. Inspect connectors and contacts for corrosion
  4. If necessary, replace the fuel injector
  5. Check the operation of the engine control unit

Related codes

P1260P1261P1262P1263

Error P1266 by Vehicle Brand

FordLincolnMercury

FAQ

What does the P1266 code mean?

P1266 is an OBD-II diagnostic trouble code that indicates: Cylinder #6 High To Low Side Short

What causes a P1266 error code?

The most common causes of P1266 include: Damage to the wiring to the injector of the 6th cylinder; Fuel injector malfunction; Short circuit in wiring harness; Problems with the engine control unit.

How do I fix a P1266 diagnostic trouble code?

To fix P1266: Check the condition of the wiring to the injector of the 6th cylinder. Check injector resistance. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1266?

Yes, but get it checked soon

How much does it cost to fix P1266?

The estimated repair cost for P1266 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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