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Home / DTC / P0113 — Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty or corroded Intake Air Temperature Sensor wiring or connections

P0113 — Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty or corroded Intake Air Temperature Sensor wiring or connections

Detailed page for trouble code P0113.

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P0113

AUDI P — Powertrain

Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty or corroded Intake Air Temperature Sensor wiring or connections

Brand: AUDI
Type: P — Powertrain
Views: UK: 40 EN: 82 RU: 163
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Page language: EN

Causes

  • Faulty IAT sensor (thermistor failure)
  • Shorted signal wire to 5V reference (high voltage on signal)
  • Poor or corroded connector or wiring (intermittent/high resistance)
  • Open or damaged ground for sensor or ECM
  • Contaminated or flooded sensor (oil/water/soot)
  • Related intake issues affecting sensor readings (very dirty air filter, defective MAF)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Incorrect intake air temperature reported in live data (very high or stuck value)
  • Cold/hot start driveability issues (rich/lean mixtures)
  • Reduced fuel economy or rough idle
  • Possible poor acceleration or stalling in some conditions
  • Codes related to MAF or fuel trim may also be present

What to check

  • Read and record freeze‑frame data and pending/current codes with an OBD‑II scanner
  • View live data: IAT temperature and IAT sensor voltage while key ON and engine running
  • Inspect IAT sensor and connector for corrosion, contamination, bent pins, or water ingress
  • Check intake air path: air filter condition and MAF sensor condition/connection
  • Backprobe the IAT signal wire to measure voltage vs. ground with ignition ON (engine off)
  • Measure reference voltage at the connector (should be close to 5V on many vehicles) and check sensor ground continuity

Signal parameters

  • IAT signal expected range: ~0.1–4.7 V (varies by vehicle). P0113 is set when signal is abnormally high (near reference/5V) or above manufacturer threshold (~4.8–5.0 V).
  • Reference voltage to sensor: ~5 V supply (verify exact vehicle spec).
  • Sensor type: NTC thermistor — resistance decreases as temperature increases (consult OEM table for exact Ω vs °C).
  • Typical ambient signal at ~20–25 °C often around mid‑range voltage (varies by sensor design)

Diagnostic algorithm

  1. Connect an OBD‑II scanner, confirm P0113 and note freeze frame/live data (IAT voltage/temperature, related MAF/trims).
  2. Visually inspect the IAT sensor, wiring, and connector for damage, corrosion, oil, water, or loose pins. Replace or clean connector as needed.
  3. Inspect intake air filter and MAF; replace dirty filter and clean/verify MAF operation if suspect.
  4. With ignition ON (engine OFF), backprobe the connector: verify 5V reference present on reference wire, good ground on ground wire, and measure IAT signal voltage. A signal near 5V indicates a high input condition.
  5. If 5V reference is present and signal is high, disconnect the IAT sensor and measure open‑circuit voltage at the harness end. If voltage remains high, suspect wiring short to reference or ECM issue. If voltage drops/changes, test sensor directly off vehicle.
  6. Remove the sensor and measure resistance at a known ambient temperature; compare to OEM resistance/temperature chart (NTC behavior). Replace sensor if resistance is out of expected range or not changing with temperature.
  7. Check continuity/shorts between the IAT signal wire and other circuits (5V reference, ignition, battery) and to ground. Repair wiring or connectors as required.
  8. After repairs or replacement, clear codes, retest engine and monitor live data to confirm correct IAT voltage/temperature and that the code does not return.
  9. If wiring and sensor check good but problem persists, consider ECM input circuit fault and consult manufacturer resources.

Likely causes

  • Corroded/loose IAT connector pins causing high/erratic voltage
  • Short from IAT signal wire to reference voltage or another live circuit
  • Failed IAT thermistor inside sensor reading out of range
  • Damaged wiring harness where it rubs/chafes and contacts a 12V/5V feed
  • MAF sensor fault or severely restricted air filter changing intake conditions and confusing diagnostics

Fault status

⚠️ Status
P0113 - Intake Air Temperature (IAT) Sensor Circuit High Input detected (Audi)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–1.5 hours

Similar codes

P0110 P0112 P0114 P0101 P0102
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