P0113
LowP0113 — Intake Air Temperature Sensor: High Signal
Description
What the Code Means
Code P0113 indicates a high signal level in the intake air temperature (IAT) sensor circuit. The voltage at the sensor is higher than expected, which usually points to an open circuit or a short to power. The IAT sensor is often integrated into the mass airflow (MAF) sensor housing and measures the temperature of the air entering the engine. The DME uses this data to adjust fuel delivery and ignition timing.
Symptoms
Symptoms
- Engine: reduced fuel economy, rough idle
- Indicators: Check Engine Light (CEL) comes on
Causes and fixes
Diagnosis and Repair
Step 1: Check the Wiring and Connector
Inspect the IAT/MAF sensor harness for damage, corrosion, or loose contacts. Check circuit continuity with a multimeter.
Step 2: Replace the Sensor
If the wiring is good, the sensor itself is the likely fault. Replace the MAF/IAT sensor (BMW part number 13627588470).
Step 3: Clear the Codes
After the repair, clear the fault codes with a diagnostic scanner (ISTA/INPA).
Possible secondary damage
Secondary Damage
Ignoring the fault can lead to incorrect mixture formation (rich or lean). Prolonged operation with a bad mixture may damage the catalytic converter or oxygen sensors, which leads to a more expensive repair.