OBD Guide
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P0099

Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1

P0099 is an OBD-II diagnostic trouble code meaning: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1. Common causes: intake air temperature sensor iat2 malfunction, damaged or corroded sensor wiring. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Check Engine light comes on
  • Unstable engine idling
  • Reduced engine power
  • Increased fuel consumption
  • Difficulty starting the engine
  • Detonation during acceleration (for turbocharged engines)
  • Black smoke from the exhaust pipe

Causes

  • Intake air temperature sensor IAT2 malfunction
  • Damaged or corroded sensor wiring
  • Poor contact in the sensor connector
  • Contamination or oxidation of connector contacts
  • Open or short circuit in the sensor circuit
  • Engine ECU malfunction
  • Mechanical damage to the sensor
  • Oil or dirt on the sensor

How to Fix

  1. Connect the scanner and read the error codes
  2. Check IAT2 sensor data in real time
  3. Visually inspect the sensor and its wiring for damage
  4. Check the condition of the sensor connector, clean the contacts
  5. Measure the resistance of the sensor with a multimeter at different temperatures
  6. Check the supply voltage and ground in the sensor connector
  7. If necessary, replace the IAT2 sensor
  8. Clear error codes and test drive
  9. Recheck the system with a scanner

Related codes

P0097P0098P0100P0101P0102P0103

Error P0099 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0099 code mean?

P0099 is an OBD-II diagnostic trouble code that indicates: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1

What causes a P0099 error code?

The most common causes of P0099 include: Intake air temperature sensor IAT2 malfunction; Damaged or corroded sensor wiring; Poor contact in the sensor connector; Contamination or oxidation of connector contacts.

How do I fix a P0099 diagnostic trouble code?

To fix P0099: Connect the scanner and read the error codes. Check IAT2 sensor data in real time. Visually inspect the sensor and its wiring for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0099?

Limited driving only, diagnose soon

How much does it cost to fix P0099?

The estimated repair cost for P0099 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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