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2019 - 2024 BMW Z4 Audio Amplifier (OEM)

Only 1 left in stock
$309.95

ℹ️ Product Notes

This is a used part. This is an amplifier for your car's radio and sound system. It works with the HiFi audio system, including the HiFi system with Active Sound Design. Important: This audio unit may need to be set up again (reprogrammed) to work correctly with your vehicle.

Fits cars with the HiFi Sound System (Option S676). Does not fit Harman Kardon. This part must be programmed to your car by a dealer or shop to work.
Condition: Excellent (A)
Like new, minimal to no wear
40,872 miles
Odometer reading when part was removed
SKU #
1349525-16231-836

Why Buy Used OEM Parts?

✓ Quality-Verified: Every used OEM part we sell has been professionally inspected and tested to ensure it meets our quality standards. While it may show some cosmetic wear from previous use, it's fully functional and ready to install.

✓ Original Equipment: This is a genuine OEM (Original Equipment Manufacturer) part - the exact same part that came with your vehicle from the factory. It's designed specifically for your make and model, ensuring perfect fitment and performance.

✓ Works Like New: Despite some visual wear, this part will perform just as well as a brand new one. The internal components and functionality are intact, giving you the same reliability you'd expect from OEM quality.

✓ Significant Savings: Save 50-80% compared to buying new! Used OEM parts offer exceptional value - you get factory quality at a fraction of the cost. It's the smart choice for budget-conscious vehicle owners who won't compromise on quality.

✓ Risk-Free Purchase: We stand behind our used parts with a generous 6-month warranty, 30-day returns, and 100% money-back guarantee. If it doesn't work out for any reason, simply return it for a full refund. You have nothing to lose!

🛡️ 30-Day Returns + 6-Month Warranty - Buy with Confidence!

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Vehicle Fitment Guide

This part fits the following vehicles:

BMW
Z4 2019-2024 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
M40i Convertible 2019 - 2024 L6 3.0L Turbo RWD | Automatic
sDrive20i M Sport Convertible 2019 - 2020 L4 2.0L Turbo RWD | Automatic
sDrive20i Sport Line Convertible 2019 - 2020 L4 2.0L Turbo RWD | Automatic
sDrive30i Convertible 2019 - 2024 L4 2.0L Turbo RWD | Automatic
M40i First Edition Convertible 2020 - 2021 L6 3.0L Turbo RWD | Automatic
sDrive M40i Convertible 2020 - 2021 L6 3.0L Turbo RWD | Automatic
sDrive20i Convertible 2021 - 2023 L4 2.0L Turbo RWD | Automatic
2022

⚠️ Important: Please verify your vehicle's year, make, model, and specifications before ordering. If you're unsure about fitment, contact our customer service team for assistance.

Policies

Shipping & Handling

  • Standard shipping: 3-7 business days via UPS Ground
  • Parts are carefully packaged to prevent damage during transit

Returns (30 Days)

We accept returns within 30 days of delivery for this part.

  • Defective parts: We will replace the part or issue a refund at our discretion
  • Electronic parts: Must be returned with the sealed inspection bag unopened. The clear bag allows full visual inspection before opening. Once opened, electronic parts can only be exchanged for a replacement if defective — no refunds
  • Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
  • Return shipping: We cover return shipping as part of our 100% money-back guarantee
  • Parts must be returned in original packaging and unmodified condition
  • Poorly packaged returns that arrive damaged will not be credited

6-Month Warranty

All used parts include a 6-month warranty from the date of purchase.

  • If your part fails within 6 months, we will send a replacement
  • Refunds are only issued if we cannot provide a suitable replacement
  • Warranty covers defects — not installation errors, misuse, or damage after installation

Note: Warranty is for replacement, not refund. A part failing on day 80? We'll replace it. But the return window for refunds is 30 days.

Damaged in Shipping?

If your part arrives damaged:

  • Stop immediately — do not install the part
  • Keep all original packaging and boxes
  • Take clear photos of the damage and packaging
  • Contact us within 48 hours of delivery

We will handle the carrier claim. You are not responsible for shipping damage — we just need your help documenting it.

Order Cancellation

Orders can be cancelled before shipment for a full refund. Once shipped, cancellations follow our return policy.

Symptoms & Diagnosis

Warning Signs the Audio Amplifier is Failing

  • No sound from some or all speakers
  • Distorted or fuzzy sound
  • Sound cuts in and out
  • Volume changes unexpectedly
  • Amplifier overheating
  • Battery drain

How to Test if This Part is the Problem

  1. Check the Fuses: Look for blown fuses related to the audio system. Replace any blown fuses and see if the problem goes away.
  2. Inspect the Wiring: Check the wiring harness and connectors going to the amplifier for damage or corrosion.
  3. Test the Speakers: Use a multimeter to test the speakers' impedance. A faulty speaker can sometimes overload the amplifier.
  4. Swap the Amplifier (if possible): If you have access to a known good amplifier, try swapping it in to see if the problem is resolved. This is the most definitive test.
  5. Consult a Professional: If you are unsure, take your vehicle to a qualified audio technician for diagnosis.

Common Failure Causes for This Part

  • Overheating due to poor ventilation
  • Water damage from leaks
  • Power surges
  • Vibration and wear over time
  • Speaker impedance mismatch

Buyer's Checklist

What to Look for When Buying This Part

  • Correct Model: Make sure the amplifier is designed for your specific BMW model and year.
  • Condition: Assess the condition of the amplifier (used, refurbished, or new).
  • Warranty: Check if the amplifier comes with a warranty.
  • Seller Reputation: Buy from a reputable seller with good reviews.

Quality Indicators for the Available Options

FeatureUsed OEMRefurbished OEMNew Aftermarket
PriceLowestMid-RangeMid-Range to Higher
Original QualityYesYes (after refurbishment)Potentially lower quality
WarrantyLimited or NoneOften IncludedOften Included
ReliabilityDepends on condition, may be shorter lifespanPotentially like-newUnknown, depends on manufacturer

What's Typically Included with the Part

  • The audio amplifier unit itself.
  • Sometimes mounting hardware (check with the seller).
  • Installation instructions may or may not be included.

Installation Overview

Difficulty Level and Estimated Time

  • Difficulty: Medium
  • Estimated Time: 1-3 hours

Special Tools Needed (if any)

  • Socket set
  • Screwdrivers
  • Multimeter (optional, for testing)
  • Trim removal tools (helpful)

Critical Steps and Tips

  1. Disconnect the Battery: Always disconnect the negative battery terminal before working on electrical components.
  2. Locate the Amplifier: The amplifier's location varies by model but is often in the trunk or under a seat.
  3. Remove the Old Amplifier: Carefully disconnect the wiring harness and remove the mounting hardware.
  4. Install the New Amplifier: Connect the wiring harness and secure the mounting hardware.
  5. Reconnect the Battery: Reconnect the negative battery terminal.
  6. Test the System: Turn on the ignition and test the audio system.

Whether DIY is Recommended or Professional Installation is Better

  • DIY is possible for those with some mechanical and electrical experience.
  • Professional installation is recommended if you are not comfortable working on your car's electrical system.

Buying Options

Compare: Used OEM, Refurbished OEM, New Aftermarket

  • Used OEM: Original equipment manufacturer part, previously used.
  • Refurbished OEM: Original equipment manufacturer part, professionally restored.
  • New Aftermarket: Brand new part made by a third-party manufacturer.

Used OEM

  • Best value option.
  • Genuine factory part.
  • Tested and inspected.
  • Significantly lower price than new.

Refurbished OEM

  • Factory part professionally restored.
  • May include new components.
  • Often comes with a warranty.
  • A good balance of price and reliability.

New Aftermarket

  • Brand new third-party part.
  • Built to OE (Original Equipment) specifications.
  • Can be a good option if OEM parts are unavailable or too expensive.

Typical Lifespan

How Long This Part Normally Lasts

  • Typically 7-10 years or more.

Factors That Affect Longevity

  • Operating temperature
  • Humidity
  • Quality of the audio signal
  • Condition of the speakers and wiring

Price Ranges

Budget vs Mid-Range vs Premium Options

  • Used OEM: $100 - $300
  • Refurbished OEM: $200 - $400
  • New Aftermarket: $250 - $500

Labor Cost Considerations if Applicable

  • Professional installation can add $100 - $300 to the total cost.

Total Job Cost Estimates

  • DIY with Used OEM: $100 - $300
  • Professional Installation with Refurbished OEM: $300 - $700

Vehicle-Specific Notes

Known Issues for This Vehicle's System Related to This Part

  • Some models are prone to water damage in the trunk area, which can affect the amplifier.
  • Certain models have issues with the wiring harness connectors corroding.

Any TSBs or Common Complaints

  • Check online forums and technical service bulletins (TSBs) for any known issues related to the audio amplifier in your specific BMW model.

Verification After Install

How to Confirm Proper Operation

  • Turn on the ignition and the radio.
  • Test all speakers to ensure they are working.
  • Adjust the volume and balance to ensure proper sound distribution.

What to Look/Listen for to Verify It's Working Correctly

  • Clear, undistorted sound from all speakers.
  • Proper volume control.
  • No unusual noises or static.
  • No overheating of the amplifier.

FAQ

Q: How do I know if my BMW audio amplifier is bad?
A: Common symptoms include no sound from some or all speakers, distorted sound, and the sound cutting in and out.

Q: Can I replace the audio amplifier myself?
A: Yes, if you have some mechanical and electrical experience. Otherwise, professional installation is recommended.

Q: Will a used OEM amplifier work as well as a new one?
A: A used OEM amplifier that has been tested and is in good working condition can be a reliable and cost-effective option.

Q: What kind of warranty comes with a used audio amplifier?
A: Warranty coverage varies depending on the seller. Some sellers offer a limited warranty or a return policy.

Q: Where is the audio amplifier located in my BMW?
A: The location varies by model, but it's often in the trunk or under a seat. Check your owner's manual for the exact location.

Part Specifications

OEM Part Numbers:

  • BMW: 65122622910, 65125A24E90, 65125A923E9, 65125A9BFB1, 65129439038

Fits Years: 2019 2020 2021 2022 2023 2024

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