Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble figuring out where the throttle valve should be when it's closed. Think of it like the car not knowing how to close its mouth properly.
This code indicates that the throttle valve on Bank 2 is not correctly registering its fully closed position, which may affect engine performance.
The throttle valve controls the amount of air entering the engine. For proper engine operation, it needs to know the exact position of the throttle when it's fully closed. This code means the adaptation process, which learns and stores this position, has failed for Bank 2.
• Check Engine Light on
• Poor engine performance
• Unstable idle
• Faulty throttle body
• Wiring issues or poor connection
• ECU software issue
Throttle Valve: A component that controls the air flow into the engine.
ECU: Engine Control Unit, the computer that manages engine functions.
• Check for additional codes
• Inspect throttle body and wiring
• Perform throttle adaptation procedure
• Clean or replace throttle body
• Repair or replace damaged wiring
• Update ECU software
• OBD-II scanner
• Multimeter
• Throttle body cleaner
$150 - $500
Moderate
• Audi A6
• Volkswagen Passat
• Porsche Cayenne
• Regular maintenance checks
• Ensure clean air intake
• Avoid harsh driving conditions
Engine Performance
• Do not ignore the Check Engine Light
• Seek professional help if unsure
• Avoid driving under high load conditions
Check with the vehicle manufacturer for specific throttle body warranty coverage.
This code has been more common in vehicles with electronic throttle control systems.
Moderate – It should be addressed soon to prevent further engine issues.
Driving with this issue may not be safe as it can affect engine response.
• Engine at operating temperature
• Vehicle in park or neutral
The throttle body is typically located between the air filter and the intake manifold.
Q: Can I drive with a P164D code?
A: It's not recommended as it can affect engine performance and safety.
Q: How do I reset the throttle adaptation?
A: You can reset it using an OBD-II scanner or by following a specific procedure outlined in the vehicle's service manual.
Budget · Bluetooth scanner
An app-based scanner with repair reports and enhanced system diagnostics on supported vehicles.
Helpful when live data and repair-report guidance can narrow down a drivability issue.
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Specialty · Fuel pressure tester
Helpful for no-start, lean, rich, injector, and fuel-delivery diagnosis.
Useful for checking whether fuel delivery is contributing to the fault.
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Specialty · Compression tester
Useful when misfire, mechanical condition, or low-cylinder-pressure problems are suspected.
Helpful when you need to rule out low compression or mechanical engine problems.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.