Intake Air Temperature Sensor 2 Circuit High (Volkswagen)
What does P1193 mean?
The P1193 code means the vehicle's onboard diagnostic system has detected: Intake Air Temperature Sensor 2 Circuit High (Volkswagen). This is a low severity code.
Common Symptoms
- Check Engine Light on
- Possible reduced boost pressure
- Minor decrease in engine performance
- Slightly reduced fuel economy
- No severe drivability symptoms
Probable Causes (Ranked by Likelihood)
- Failed intake air temperature sensor 2 (open element) Very High
- Open circuit in IAT sensor 2 wiring High
- Disconnected or loose sensor connector Moderate
- Corroded ground connection for sensor circuit Moderate
- ECM input fault Low
Step-by-Step Diagnostic Procedure
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Check IAT sensor 2 data on a scan tool (high voltage = ECM thinks air is very cold)
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Inspect the sensor connector for a secure connection
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Measure sensor resistance -- should decrease as temperature increases
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Check wiring continuity from sensor to ECM
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Replace the sensor if resistance is open or out of specification
Frequently Asked Questions
What does high circuit mean for P1193?
High circuit voltage means the ECM is receiving a signal indicating very cold intake air temperature. This is usually caused by an open sensor element or disconnected wiring, not actual cold air.
Can P1193 affect turbo performance?
Yes. The ECM uses intake air temperature data to manage boost pressure. If the sensor reads incorrectly cold, the ECM may adjust boost and fuel delivery, slightly reducing performance as a precaution.
Where is IAT sensor 2 on a VW 2.0T?
On VW 2.0T TSI engines, IAT sensor 2 is typically located in the charge pipe or intercooler outlet. It is usually a small sensor with a two-pin connector, accessible from the top of the engine bay.