AC Schnitzer BMW 320d Power Module for 3 Series G20/G21 (2018+) - Plug & Play Diesel Tuning Box, Piggyback/Add-On ECU, Performance Chip/Power Box, Remap Alternative, Warranty-Safe Upgrade for Saloon & Touring 2.0d

AC Schnitzer 320d G20 G21 Power Module for BMW 3 Series

Give your 3 Series 2.0 diesel the muscle it deserves with the AC Schnitzer auxiliary control unit for the BMW 320d saloon and Touring. This quick-fit add-on module delivers a noticeable uplift in torque and real-world pace while your factory calibration remains untouched. If you are searching for a BMW 320d diesel power module, BMW 3 Series 320d chip tuning alternative, BMW G20 G21 diesel performance chip or a dealer-safe upgrade that keeps servicing simple, this AC Schnitzer solution is the benchmark.

Engineered by renowned BMW specialists, the AC Schnitzer add-on ECU communicates via CAN bus for safe, consistent gains and OEM-grade drivability. Expect stronger mid-range pull, smoother acceleration and confident overtakes with an efficient delivery that suits daily driving. We have fitted this unit for many customers and feedback has been superb on responsiveness, refinement and ease of use.

Why this diesel power pack is the smart choice

• Service-friendly enhancement that leaves your original software intact and dealer updates straightforward
• Secondary ECU works with CAN bus for reliable, repeatable power delivery
• OEM+ feel with crisp throttle response and effortless in-gear acceleration
• Efficient performance with no increase in emissions in most cases
• Ideal alternative to a remap for those who want performance without ECU flashing
• Premium quality from AC Schnitzer, a leading name in BMW upgrades
• Supplied with vehicle-specific harness for a clean, reversible installation

Warranty and peace of mind

AC Schnitzer provides a dedicated warranty that runs alongside the BMW new car warranty. Coverage is for 3 years from first registration for the tuned engine and drivetrain, subject to conditions. For vehicles tested to WLTP standard with applicable exhaust particulate filters, these components are included within the scope of the cover.

In the UK, AC Schnitzer products carry a two-year manufacturer’s warranty, or until the end of the BMW 3 year warranty period, whichever is longer.

Compatibility

• BMW 3 Series 320d G20 saloon and G21 Touring, 2018 onwards

Installation and fitting

Supplied with clear German and English instructions. Recommended installation time is approximately 1 hour. No coding required, making it a great non-flash upgrade for G20 and G21 owners who want more performance without touching the factory ECU.

Download the AC Schnitzer installation guide

Prefer expert fitting. Book installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Product details and registration

• Factory software is retained for easy dealer servicing and updates
• Secondary ECU architecture prioritises longevity and drivetrain protection
• Product registration is required after purchase and we will contact you for details
• Tuned for real-world torque and seamless delivery across the rev range

Part number

121410420-01-36

Trusted BMW 320d enhancement from AC Schnitzer

If you are comparing a BMW 320d remap alternative, diesel performance chip, power box or add-on ECU for the G20 G21 3 Series, this AC Schnitzer module stands out for OEM-level quality, drivability and convenience. Our customers love the instant mid-range shove and smoothness, and we rate it highly as a fast, dealer-friendly upgrade that simply works.

Note: Conditions apply to all warranties. Product registration required.