OEM Air Flow Meter for 2001-2010 BMW M3, M5, M6, Z3, Z4

Before you buy a replacement AFM for your BMW, here's what to consider:

• Check the part number: While this page is for your vehicle, always double-check the part matches your original.
• Read reviews: See what other BMW owners have to say about the part.
• Buy from a trusted source: Make sure you're buying from a reputable seller.

Quality indicators:

• OEM vs. Aftermarket: OEM (Original Equipment Manufacturer) parts are made by the same company that made the original part for your car. Aftermarket parts are made by other companies.
• Warranty: A good warranty shows the seller has confidence in the part.
• Condition: If buying a used part, check for any signs of damage or wear.

What's typically included:

• The AFM sensor itself.
• Sometimes, a new gasket or O-ring.

Replacing the AFM is generally a straightforward job that most DIYers can handle.

Difficulty level: Easy to Medium Estimated time: 30 minutes to 1 hour

Special tools needed:

• Screwdriver (usually a flathead or Phillips head)
• Socket set (for removing the air filter housing, if needed)
• Scan tool (to clear any engine codes after installation)

Critical steps and tips:

1. Disconnect the negative battery cable. This prevents electrical shorts.
2. Locate the AFM. It's usually located in the air intake tube, near the air filter housing.
3. Disconnect the electrical connector from the AFM.
4. Loosen the clamps that hold the AFM in place.
5. Remove the old AFM.
6. Install the new AFM, making sure it's facing the correct direction.
7. Tighten the clamps.
8. Reconnect the electrical connector.
9. Reconnect the negative battery cable.

DIY or professional installation?

• If you're comfortable working on your car and have basic tools, you can probably replace the AFM yourself.
• If you're not sure, or if you're having trouble, it's best to take it to a professional mechanic.

There are several options when buying a replacement AFM for your BMW:

• Used OEM: These are genuine factory parts that have been removed from other vehicles. They're tested and inspected to ensure they're in good working condition. This is a great way to save money without sacrificing quality.
• Refurbished OEM: These are also factory parts, but they've been professionally restored with new components. This can be a good option if you want a part that's been thoroughly checked and repaired.
• New Aftermarket: These are brand new parts made by third-party companies. They're built to meet or exceed OE specifications.

All three options can be good choices, depending on your budget and needs. Used OEM parts offer excellent value, refurbished parts provide a like-new experience, and new aftermarket parts offer a fresh start.

When replacing the AFM, it's a good idea to check other related parts as well:

• Air Filter: A dirty air filter can restrict airflow and damage the AFM.
• Intake Boots: Cracked or damaged intake boots can cause air leaks, which can affect the AFM's readings.
• Oxygen Sensors: Faulty oxygen sensors can cause the engine to run rich or lean, which can also damage the AFM.

Replacing these parts at the same time can help prevent repeat failures and ensure your engine is running smoothly.

The typical lifespan of an AFM is around 60,000 to 100,000 miles.

Factors that affect longevity:

• Air Filter Maintenance: Regularly replacing the air filter can prevent dirt and debris from damaging the AFM.
• Driving Conditions: Driving in dusty or dirty conditions can shorten the AFM's lifespan.
• Engine Maintenance: Keeping your engine properly maintained can help prevent oil leaks and other problems that can damage the AFM.

The price of an AFM can vary depending on the brand, condition, and where you buy it.

• Budget: Used OEM - $50 - $100
• Mid-Range: Refurbished OEM - $100 - $200
• Premium: New Aftermarket - $150 - $300

Labor costs:

• If you choose to have a mechanic install the AFM, labor costs can range from $50 to $150, depending on the shop's hourly rate.

Total job cost estimates:

• DIY: $50 - $300 (depending on the part you choose)
• Professional Installation: $100 - $450 (including parts and labor)

The BMW M3, Z3, and Z4 models from 2001-2010 with the S54 engine are known to be sensitive to air intake leaks. Any unmetered air entering the engine can cause the AFM to misread, leading to performance issues. Regularly inspect the intake boots and hoses for cracks or leaks. Some owners have reported issues with aftermarket AFMs not working as well as OEM parts on these vehicles.

After installing the new AFM, it's important to verify that it's working properly.

• Check Engine Light: Make sure the check engine light is off. If it's still on, use a scan tool to read the codes and see if there are any new issues.
• Engine Performance: Pay attention to how the engine is running. It should idle smoothly, accelerate without hesitation, and get good gas mileage.
• Listen for unusual noises: There shouldn't be any unusual hissing or whistling sounds coming from the engine.

Q: How do I know if my AFM is bad?
A: Common symptoms include a rough idle, stalling, poor acceleration, and a check engine light.

Q: Can I clean my AFM instead of replacing it?
A: Cleaning might help, but it's often a temporary fix. It's usually better to replace the AFM if it's faulty.

Q: Will a bad AFM affect my gas mileage?
A: Yes, a bad AFM can cause poor gas mileage.

Q: Is it difficult to replace an AFM?
A: No, it's generally a straightforward job that most DIYers can handle.

Q: What happens if I drive with a bad AFM?
A: Driving with a bad AFM can damage your engine over time. It's best to replace it as soon as possible.

OEM Part Numbers:

• BMW: 13627830359, 13627839014
• Bosch: 0280218062

Fits Years: 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010