OBD Guide
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P1291

No Temperature Rise Seen From Intake Air Heater

P1291 is an OBD-II diagnostic trouble code meaning: No Temperature Rise Seen From Intake Air Heater. Common causes: intake air heater malfunction, open or short circuit in the heater circuit. Estimated repair cost: $17–89.

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

Symptoms

  • Difficulty starting the engine in cold weather
  • Increased fuel consumption
  • Increased emissions
  • Check Engine Light Is On
  • Reduced engine power in cold conditions

Causes

  • Intake air heater malfunction
  • Open or short circuit in the heater circuit
  • Heater relay problems
  • Intake air temperature sensor malfunction
  • Problems with the engine control unit

How to Fix

  1. Check the power and ground of the heater circuit
  2. Check heater resistance
  3. Check the operation of the heater relay
  4. Check intake air temperature sensors
  5. If necessary, replace the intake air heater

Related codes

P1290P1292P0110

Error P1291 by Vehicle Brand

DodgeFordJeepLincolnMercuryPlymouthPontiac

FAQ

What does the P1291 code mean?

P1291 is an OBD-II diagnostic trouble code that indicates: No Temperature Rise Seen From Intake Air Heater

What causes a P1291 error code?

The most common causes of P1291 include: Intake air heater malfunction; Open or short circuit in the heater circuit; Heater relay problems; Intake air temperature sensor malfunction.

How do I fix a P1291 diagnostic trouble code?

To fix P1291: Check the power and ground of the heater circuit. Check heater resistance. Check the operation of the heater relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1291?

Yes, but get it checked soon

How much does it cost to fix P1291?

The estimated repair cost for P1291 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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