Intake Manifold Air Temperature Sensor Circuit (Bank 1)
The P0074 code means the vehicle's onboard diagnostic system has detected: Intake Manifold Air Temperature Sensor Circuit (Bank 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $40 - $250 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Poor engine performance and reduced power
- Rich or lean fuel mixture
- Rough idle especially when cold
Probable Causes (Ranked by Likelihood)
- Faulty intake air temperature sensor Very High
- Damaged wiring or connector to IAT sensor High
- Intake manifold vacuum leak affecting sensor readings Moderate
- PCM/ECM failure Low
Frequently Asked Questions
What is Bank 1 for the intake manifold sensor?
Bank 1 refers to the side of the engine containing cylinder 1. On inline engines, there is only one bank, so this is the primary sensor location.
Can I drive with P0074?
You can drive short distances, but the incorrect air temperature reading may cause the engine to run rich or lean, affecting performance and potentially damaging the catalytic converter.
How is P0074 different from P0110?
P0074 is specific to the intake manifold air temperature sensor on Bank 1, while P0110 refers to the general intake air temperature sensor circuit.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Read the intake air temperature PID on a scan tool. Compare to ambient temperature with a cold engine (should be close).
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Locate the IAT sensor on the intake manifold (Bank 1). Disconnect and measure resistance. Typical: 2-3k ohms at 68F (20C).
-
Inspect wiring and connector for damage, corrosion, or loose pins. Check for oil contamination from PCV system.
-
Monitor IAT readings during a drive. Values should rise gradually with engine heat. Erratic readings indicate sensor failure.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2010-2020 BMW 328i
- 2012-2019 Mercedes-Benz C300
- 2008-2018 Audi A4
- 2011-2020 Volkswagen Passat
Related Codes
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