Code
P00AB
Generic
P — Powertrain
Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 2
Views:
UK: 18
EN: 33
RU: 31
AI status
Completed
Completed
100%
Causes
- Damaged or shorted sensor wiring or connector (open, short to ground or battery, high resistance)
- Faulty IAT sensor (thermistor out of spec or damaged)
- Corroded or loose connector pins or contaminated connector
- Intake ducting or sensor contaminated by oil, debris or water
- ECU fault or poor ground at ECU
- Previous repair damage or sensor installed incorrectly
Symptoms
- Check Engine Light (MIL) illuminated and P00AB stored
- Incorrect air temperature displayed in scan tool vs ambient
- Hard cold starts, extended crank time, or rich/lean running on start
- Reduced fuel economy or drivability issues under some conditions
- Unstable idle or hesitation during acceleration (if ECU mis-adjusts fueling)
What to check
- Read stored trouble codes and freeze frame/live data for IAT Bank 2 Sensor 1
- Compare IAT sensor reading (°C/°F) to outside ambient temperature and to other temperature sensors (if available)
- Visually inspect sensor and wiring harness for damage, rubbing, pin corrosion or heat damage
- Check connector for water, oil, debris and push/pull fit of terminals
- Backprobe sensor connector and verify reference voltage and ground from ECU
- Measure sensor resistance at several known temperatures (or compare to a replacement sensor spec)
Signal parameters
- Sensor type: usually NTC thermistor (resistance decreases as temperature rises)
- Typical resistance behavior (example): ~2–6 kΩ at 20–25 °C (varies by manufacturer) — check OEM spec for exact values
- Expected voltage range at sensor signal: typically ~0.1–4.9 V depending on temperature and ECU pull-up/pull-down
- Reference circuit: most ECUs supply a stable reference voltage (commonly 5 V or less) and measure voltage drop across sensor
- Fault triggers: open circuit (voltage pegged high or low), short to ground/battery, implausible/fast jumps in temperature reading
Diagnostic algorithm
- Retrieve P00AB and any related codes; record freeze frame and live IAT Bank 2 Sensor 1 data.
- With ignition ON (engine off), visually inspect the sensor, connector and wiring for damage, corrosion or contamination. Repair as needed.
- Compare the live IAT reading to ambient air temperature (digital thermometer). If reading is wildly different, suspect sensor/circuit fault.
- Backprobe the sensor connector: verify reference voltage (per manufacturer, often ~5 V), sensor signal voltage, and good ground. Look for intermittent readings while wiggling harness.
- With connector disconnected, measure sensor resistance across its terminals at known ambient temperature(s). Compare to OEM resistance/temperature chart. If out of spec, replace sensor.
- If resistance is open/short, trace and repair wiring short/open between sensor and ECU. Repair connectors or pins as needed.
- If voltages/resistance are within spec, check ECU grounds and earth connections. Swap with known-good sensor location (if applicable) or substitute a known-good sensor to confirm.
- After repair, clear codes and perform drive cycle. Recheck for reoccurrence and monitor IAT behavior under different ambient and engine conditions.
- If fault persists after wiring and sensor replacement, consider ECU diagnosis or reflash per manufacturer guidance.
Likely causes
- Broken or chafed wiring between sensor and ECU
- Water ingress or corrosion in sensor connector
- Failed NTC thermistor inside the IAT sensor
- Connector pin backed out or pushed past terminal stop
- Vacuum leak or intake leak affecting sensor reading (rare)
Fault status
Status
Intake Air Temperature Sensor 1 (Bank 2) — circuit range/performance fault. Sensor output out of expected range or response is implausible.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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