OEM Throttle Body Assembly for 2001-2008 BMW M3, Z3, Z4

What to look for when buying this part:

• Ensure the part is compatible with your specific BMW model and year.
• Check the part's condition (especially for used parts).
• Verify the part includes all necessary components.

Quality indicators for the available options:

What's typically included with the part:

• The throttle body assembly itself
• Throttle position sensor (TPS) (sometimes included)
• Idle air control (IAC) valve (sometimes included)
• Gasket (sometimes included)

Difficulty level and estimated time:

• Difficulty: Intermediate
• Estimated Time: 1-2 hours

Special tools needed (if any):

• Socket set
• Screwdrivers
• Pliers
• OBD-II scanner (for clearing codes)
• Torque wrench

Critical steps and tips:

1. Disconnect the battery: This prevents electrical shorts during the installation.
2. Remove the air intake: Disconnect the air intake hose and any other components attached to the throttle body.
3. Disconnect electrical connectors: Carefully disconnect all electrical connectors from the throttle body.
4. Remove the old throttle body: Unbolt the old throttle body from the intake manifold.
5. Install the new throttle body: Install the new throttle body and tighten the bolts to the manufacturer's specified torque.
6. Reconnect electrical connectors: Reconnect all electrical connectors.
7. Reinstall the air intake: Reinstall the air intake hose and any other components.
8. Reconnect the battery: Reconnect the battery.
9. Clear trouble codes: Use an OBD-II scanner to clear any trouble codes.

Whether DIY is recommended or professional installation is better:

• DIY is possible for mechanically inclined individuals.
• Professional installation is recommended if you are not comfortable working on your car or if you lack the necessary tools.

Compare: Used OEM, Refurbished OEM, New Aftermarket

Choosing the right throttle body assembly depends on your budget and priorities. Each option offers a unique balance of cost, quality, and reliability.

Used OEM: Best value - genuine factory parts, tested and inspected, at significantly lower prices. These parts offer the reliability of a factory-made component without the high cost of a new part.

Refurbished OEM: Factory parts professionally restored with new components. This option provides a like-new part at a reduced cost compared to new aftermarket options.

New Aftermarket: Brand new third-party parts built to OE specs. These parts offer the benefit of being brand new, but the quality can vary depending on the manufacturer.

Parts commonly replaced or checked at the same time:

• Intake manifold gasket
• Air intake hose
• Idle air control (IAC) valve
• Throttle position sensor (TPS)

Why replacing related parts prevents repeat failures:

• Replacing worn or damaged related parts can prevent future problems and ensure optimal engine performance. For example, a cracked intake manifold gasket can cause vacuum leaks that mimic throttle body issues. Replacing the gasket at the same time ensures a proper seal and prevents future leaks.

How long this part normally lasts:

• 75,000 - 150,000 miles or 7-10 years

Factors that affect longevity:

• Driving conditions (frequent stop-and-go driving can shorten lifespan)
• Regular maintenance (cleaning the throttle body can extend lifespan)
• Quality of replacement parts (OEM parts tend to last longer)
• Environmental factors (extreme temperatures can affect lifespan)

Budget vs mid-range vs premium options:

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

Labor cost considerations if applicable:

• Professional installation: $100 - $300

Total job cost estimates:

• DIY with Used OEM: $50 - $150 (plus cost of any needed tools)
• DIY with Refurbished OEM: $100 - $250 (plus cost of any needed tools)
• DIY with New Aftermarket: $150 - $350 (plus cost of any needed tools)
• Professional Installation with Used OEM: $150 - $450
• Professional Installation with Refurbished OEM: $200 - $550
• Professional Installation with New Aftermarket: $250 - $650

Known issues for this vehicle's system related to this part:

• The BMW M3, Z3, and Z4 (2001-2008) with the S54 engine are known for carbon buildup in the throttle body, which can lead to rough idling and poor performance.
• Some owners have reported issues with the throttle position sensor (TPS) failing prematurely.

Any TSBs or common complaints:

• Check with the National Highway Traffic Safety Administration (NHTSA) website for any Technical Service Bulletins (TSBs) related to the throttle body on your specific BMW model and year.

How to confirm proper operation:

• Start the engine and let it idle.
• Check for smooth idling and no stalling.
• Accelerate the engine and check for smooth acceleration without hesitation.
• Use an OBD-II scanner to check for any new trouble codes.

What to look/listen for to verify it's working correctly:

• Smooth and consistent engine idle.
• Responsive throttle response.
• No unusual noises from the engine.
• No check engine light.

Q: How often should I clean my throttle body?
A: It is recommended to clean your throttle body every 30,000 miles or every 2-3 years.

Q: Can a bad throttle body cause my car to fail an emissions test?
A: Yes, a faulty throttle body can cause your car to fail an emissions test due to incomplete combustion or incorrect air-fuel mixture.

Q: What happens if I don't replace a faulty throttle body?
A: Ignoring a faulty throttle body can lead to poor engine performance, reduced fuel economy, and potential damage to other engine components.

Q: Will a new throttle body improve my car's gas mileage?
A: If your old throttle body was causing poor fuel economy, replacing it with a new one can improve your gas mileage.

Q: Do I need to reprogram my car's computer after replacing the throttle body?
A: Some vehicles may require a throttle body adaptation or relearn procedure after replacement. Consult your vehicle's service manual or a qualified mechanic for specific instructions.

OEM Part Numbers:

• BMW: 13547831800, 13547832169, 13547840423

Fits Years: 2001 2002 2003 2004 2005 2006 2007 2008