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P0127 Nissan Code - Intake Air Temperature Too High

Quick Answer

The P0127 code for Nissan vehicles indicates that the intake air temperature is too high. Common causes include Faulty intake air temperature sensor, Dirty or clogged air filter, Vacuum leak in the intake system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0127 Nissan indicates Intake Air Temperature Too High.
Common causes
Common causes include Faulty intake air temperature sensor, Dirty or clogged air filter, Vacuum leak in the intake system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0127 Nissan Description

The P0127 code for Nissan vehicles indicates that the intake air temperature is too high. This means that the intake air entering the engine is warmer than it should be, which can negatively affect the engine's performance and efficiency. The intake air temperature sensor measures the temperature of the air entering the engine and sends this information to the engine control module (ECM). If the sensor detects a temperature that is outside of the expected range, the P0127 code is triggered.

OBDII Code P0127 Nissan - Intake Air Temperature Too High
P0127 Nissan Code - Intake Air Temperature Too High

Common Causes of P0127 Nissan

  1. Faulty intake air temperature sensor
  2. Dirty or clogged air filter
  3. Vacuum leak in the intake system
  4. Engine overheating
  5. Wiring or electrical issues

Symptoms of P0127 Nissan

  1. Decreased fuel efficiency
  2. Loss of power
  3. Engine hesitation or stalling
  4. Check Engine Light illuminated
  5. Rough idling

How to Fix P0127 Nissan

  1. Diagnose the issue using a scan tool to verify the P0127 code and check the intake air temperature sensor readings.
  2. Inspect the intake air temperature sensor for any signs of damage or corrosion and replace if necessary.
  3. Check and replace the air filter if dirty or clogged.
  4. Inspect the intake system for any vacuum leaks and repair as needed.
  5. Address any engine overheating issues that may be contributing to the high intake air temperature.

Cost to Fix P0127 Nissan

The cost of repairing a P0127 code on a Nissan vehicle can vary depending on the specific cause of the issue. In general, the cost of replacing an intake air temperature sensor ranges from $50 to $150, while diagnosing and addressing other potential causes such as a dirty air filter or vacuum leak may incur additional costs. Overall, the total repair cost for this issue could range from $100 to $300, including parts and labor. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P0127 Nissan

If the Intake Air Temperature (IAT) is part of the Mass Air Flow (MAF) the MAF assembly will need to be replaced to fix the problem.

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Information for Specific Nissan Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0127 Nissan Code

No Frequently Asked Questions about P0127 Nissan Code found.

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  • Codes read at auto part store were
    P0127 - intake air temp sensor - 2-i
    P0300B - random misfire
    P0328- knock sensor

    Symptoms are engine running rich, spark plugs being fouled, abnormal idle in drive(600 in D, 900 in P), will check IAT sensor for proper grounding and resistance before replacing

    Reply to Comment

  • Neither the knock sensor or the Intake Temperature Sensor will cause the engine to run rich (rich enough mixture to be noticeable), but there must be something else causing the random misfire. My guess is that one or more of the ignition coils is not working properly, causing the spark plugs to fouled and the rich mixture.
    If you clear the codes, what code comes back first?

    Reply to Comment

  • I haven't tried clearing them and testing it. I don't know when the light comes on, as my SES light bulb is blown. For a long time, didn't even know I had a light that was on. It could very well just be the coil pack. One day, my car wasn't starting so I took all the coil packs out, knowing it was probably just flooding. And sure enough, when I took the 3rd from the left out, Cyl 3 I'm guessing, a very visible vapor of gas come out of the top. Do you think I'd be safe just replacing them all, one at a time, or just the one in Cyl 3?

    Also, thank you for your reply. I wasn't expecting one

    Reply to Comment

  • Since the coils are easy to replace, I would start with just one (#3).

    Reply to Comment