OBD Guide
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P1242

Injector Circuit Open Cylinder 6

P1242 is an OBD-II diagnostic trouble code meaning: Injector Circuit Open Cylinder 6. Common causes: broken wires to the injector, malfunction of the injector itself. Estimated repair cost: $17–89.

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

Symptoms

  • The engine runs unevenly
  • Engine vibration
  • Power reduction
  • Increased fuel consumption
  • Check Engine Light Is On

Causes

  • Broken wires to the injector
  • Malfunction of the injector itself
  • Poor contact in the injector connector
  • Problems with the engine control unit
  • Short circuit in the injector circuit

How to Fix

  1. Check the integrity of the wires to the injector
  2. Check injector resistance
  3. Clean the contacts of the injector connector
  4. Check the presence of a control signal from the ECU
  5. If necessary, replace the injector

Related codes

P1240P1241P1243

Error P1242 by Vehicle Brand

AcuraHondaInfinitiJaguarVolkswagen

FAQ

What does the P1242 code mean?

P1242 is an OBD-II diagnostic trouble code that indicates: Injector Circuit Open Cylinder 6

What causes a P1242 error code?

The most common causes of P1242 include: Broken wires to the injector; Malfunction of the injector itself; Poor contact in the injector connector; Problems with the engine control unit.

How do I fix a P1242 diagnostic trouble code?

To fix P1242: Check the integrity of the wires to the injector. Check injector resistance. Clean the contacts of the injector connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1242?

Do not drive — repair immediately

How much does it cost to fix P1242?

The estimated repair cost for P1242 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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