Intake Air Temperature Sensor 2 Circuit Low (Volkswagen)
What does P1192 mean?
The P1192 code means the vehicle's onboard diagnostic system has detected: Intake Air Temperature Sensor 2 Circuit Low (Volkswagen). This is a low severity code.
Common Symptoms
- Check Engine Light on
- Slightly reduced engine performance
- Minor fuel economy decrease
- Possible boost pressure management issues
- No major drivability problems
Probable Causes (Ranked by Likelihood)
- Faulty intake air temperature sensor 2 Very High
- Short to ground in sensor wiring High
- Corroded sensor connector Moderate
- Intercooler charge pipe leak affecting readings Moderate
- ECM input circuit fault Low
Step-by-Step Diagnostic Procedure
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Read IAT sensor 2 data with a VAG-COM or compatible scan tool
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Compare IAT sensor 2 reading to IAT sensor 1 and ambient temperature
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Inspect the sensor connector for corrosion or water damage
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Check wiring for short to ground
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Replace the sensor if readings are out of specification
Frequently Asked Questions
What is IAT sensor 2 on a VW?
On turbocharged VW engines, IAT sensor 2 is typically located after the intercooler. It measures the temperature of the charge air after it has been cooled, helping the ECM optimize boost pressure and fuel delivery.
Can an intercooler leak cause P1192?
Indirectly. If the intercooler or charge pipe is leaking, hot ambient air may reach the sensor, causing unusual readings. However, P1192 specifically indicates an electrical circuit issue (low voltage) rather than an air temperature concern.
Do I need a VAG-COM to diagnose VW codes?
While a generic OBD-II scanner can read P-codes, a VAG-COM (VCDS) or equivalent VW-specific scan tool provides much more detailed data, including manufacturer-specific parameters that help with accurate diagnosis.