2012 - 2016 BMW Z4 Throttle Body Assembly (OEM)

Buying a throttle body assembly requires careful consideration. Here's what to look for:

Key Considerations:

• Condition: Decide whether you want a used, refurbished, or new aftermarket part.
• Quality: Look for reputable brands or suppliers.
• Completeness: Ensure all necessary components are included (gaskets, sensors, etc.).
• Warranty: Check for a warranty to protect against defects.
• Price: Compare prices from different sources.

Quality Indicators:

• For used parts, look for units that have been tested and inspected.
• Refurbished units should have undergone a professional restoration process.
• New aftermarket parts should meet or exceed OE specifications.

What's Included:

• The throttle body assembly itself
• Throttle position sensor (TPS) - may or may not be included
• Idle air control (IAC) valve - may or may not be included
• Gasket or O-ring

Replacing a throttle body assembly is a moderately difficult task.

Difficulty Level: Intermediate

Estimated Time: 1-2 hours

Special Tools:

• Socket set
• Screwdrivers
• Torque wrench
• Throttle body cleaner (optional)

Critical Steps and Tips:

1. Disconnect the negative battery cable.
2. Remove the air intake duct.
3. Disconnect the electrical connector from the throttle body.
4. Disconnect any vacuum lines or coolant hoses attached to the throttle body.
5. Unbolt the throttle body from the intake manifold.
6. Clean the mating surfaces of the intake manifold and throttle body.
7. Install the new throttle body with a new gasket.
8. Reconnect all hoses and electrical connectors.
9. Reinstall the air intake duct.

DIY or Professional?

• If you are comfortable working on cars and have the necessary tools, you can likely replace the throttle body yourself.
• If you are not mechanically inclined or lack the tools, it is best to have a professional mechanic do the job.

There are several options when buying a replacement throttle body assembly:

Used OEM:

• These are genuine factory parts that have been removed from used vehicles.
• They offer the best value, providing OEM quality at a lower price.
• Used parts are typically tested and inspected to ensure they are in good working condition.

Refurbished OEM:

• These are factory parts that have been professionally restored to like-new condition.
• They often include new components, such as sensors and gaskets.
• Refurbished parts offer a good balance of quality and price.

New Aftermarket:

• These are brand new parts manufactured by third-party companies.
• They are built to meet or exceed OE specifications.
• Aftermarket parts can be a good option if you are looking for a new part at a competitive price.

When replacing the throttle body assembly, consider these related parts:

• Air Filter: A dirty air filter can restrict airflow and put extra strain on the throttle body.
• Intake Manifold Gasket: If you remove the intake manifold, replace the gasket to prevent leaks.
• Mass Air Flow (MAF) Sensor: A faulty MAF sensor can cause similar symptoms to a bad throttle body.
• Throttle Position Sensor (TPS): Sometimes the TPS fails independently of the throttle body.
• Idle Air Control (IAC) Valve: If your vehicle has a separate IAC valve, consider replacing it at the same time.

Replacing these parts can help prevent repeat failures and ensure optimal engine performance.

A throttle body assembly typically lasts for 75,000 to 150,000 miles.

Factors Affecting Longevity:

• Driving conditions (city vs. highway)
• Maintenance habits (air filter replacement)
• Quality of fuel
• Environmental factors (dust, humidity)

The price of a throttle body assembly can vary depending on the type and brand.

• Used OEM: $50 - $150
• Refurbished OEM: $100 - $250
• New Aftermarket: $150 - $350

Labor Costs:

• Professional installation typically costs $100 - $300, depending on the shop and location.

Total Job Cost Estimates:

• DIY: $50 - $350 (parts only)
• Professional Installation: $150 - $650 (parts and labor)

Some 2012-2018 BMW models are known to experience carbon buildup in the throttle body, leading to rough idling and stalling. Regular cleaning of the throttle body can help prevent this issue. Also, some models have had reported issues with the throttle position sensor.

After installing the new throttle body assembly, verify proper operation:

• Start the engine and let it idle.
• Check for smooth idling and acceleration.
• Use a scan tool to check for any trouble codes.
• Listen for any unusual noises from the engine.
• Take the vehicle for a test drive to ensure it is running properly.

What to Look/Listen For:

• Smooth and consistent idle
• Responsive acceleration
• No hesitation or stalling
• No check engine light

Q: How do I know if my throttle body is bad?
A: Common symptoms include rough idling, stalling, hesitation, and a check engine light.

Q: Can I clean my throttle body instead of replacing it?
A: Yes, cleaning the throttle body can sometimes resolve issues caused by carbon buildup. However, if the throttle body is damaged or has electrical problems, it will need to be replaced.

Q: Is it difficult to replace a throttle body myself?
A: Replacing a throttle body is a moderately difficult task that requires some mechanical knowledge and tools. If you are not comfortable working on cars, it is best to have a professional mechanic do the job.

Q: What kind of warranty comes with a used throttle body?
A: Warranty coverage varies depending on the seller. Check the warranty terms before you buy.

Q: Will a new throttle body improve my gas mileage?
A: If your old throttle body was faulty and causing poor engine performance, a new throttle body can potentially improve your gas mileage.

OEM Part Numbers:

• BMW: 13547588625, 7588625

Fits Years: 2012 2013 2014 2015 2016