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BMW 135i E82/E88 N54 / N55

The BMW 135i belongs to the E82/E88 1 Series Coupé & Convertible generation, built approximately 2007–2013. Production moved from the N54 to the N55 engine family at approximately 2010, so the exact engine must be confirmed on each vehicle. Covered body styles are Coupé and Convertible. Depending on the variant, it was offered with rear-wheel drive, paired with a manual gearbox or an automatic gearbox. Engine management is by a BMW DME; identify the exact ECU hardware and software from the vehicle before ordering a file.

Model & Generation Context

Engine families

N54 → N55

Exact revision is production-date and vehicle-specific

Displacement

3.0L

Production

c. 2007–2013

Approximate; confirm the build date from the vehicle

Fuel Type

Petrol

Supported Model Variants

BMW 135i

Engine: N54

Production: c. 2007–2010

Chassis: E82, E88 · Coupé, Convertible

Drivetrain: RWD

BMW 135i

Also sold as 135is (US)

Engine: N55

Production: c. 2010–2013

Chassis: E82, E88 · Coupé, Convertible

Drivetrain: RWD

Engine and Production Transition

Earlier engine family

N54

Listed production: 2007–2010

ECU: BMW DME — identify from vehicle

Later engine family

N55

Listed production: 2010–2013

ECU: BMW DME — identify from vehicle

Approximate transition period: around 2010. The changeover date varies by market, body style and production date and should not be treated as exact.

The exact engine and ECU must be confirmed from the vehicle before any file is ordered.

Engine Platform

BMW N54 Engine Hub

Platform overview, tuning paths, reliability notes and diagnostics

BMW N55 Engine Hub

Platform overview, tuning paths, reliability notes and diagnostics

All BMW N54 Models

Every model in the directory using the N54 engine

All BMW N55 Models

Every model in the directory using the N55 engine

ECU & Transmission Context

BMW DME — identify from vehicle

Read the ECU hardware and software numbers from the vehicle before ordering a file.

BMW DME — identify from vehicle

Read the ECU hardware and software numbers from the vehicle before ordering a file.

Manual gearbox

Gearbox specification is vehicle-specific; confirm it from the vehicle order data.

Automatic gearbox

Gearbox specification is vehicle-specific; confirm it from the vehicle order data.

Identification & Pre-Tuning Checks

  • This model was built with more than one engine family (N54 and N55); confirm the engine code on the vehicle before ordering a file.
  • The exact engine revision is production-date and vehicle-specific; it is not inferred from the model name.
  • Identify the BMW DME and its exact hardware and software version from the vehicle; it is not inferred from the model name.
  • Scan for stored fault codes and resolve existing issues before any calibration work.
  • Gearbox type varies on this model; note whether the car is manual or automatic when submitting a file.

Available Service Paths

Stage 1 Calibration File

A vehicle-specific calibration for a healthy engine on standard hardware. Includes ECU file review, fuel and hardware assessment.

Request a Stage 1 File

Stage 2 Calibration Review

Review your supporting hardware, thermal setup and fuel configuration before requesting an upgraded calibration file.

Review My Stage 2 Setup

Custom Calibration and Datalog Review

Submit datalogs and vehicle configuration for a fully custom calibration review tailored to your specific setup.

Request a Custom Calibration

ECU Read and Support Check

Verify your ECU hardware and software version is supported before starting a calibration project.

Check ECU Support

TCU Calibration Assessment

Assess transmission control unit compatibility and calibration options for your vehicle and gearbox configuration.

Request a TCU File

Pops and Bangs Request Review

Submit a request for review. Availability depends on vehicle setup, hardware configuration and local road-use requirements.

Availability depends on vehicle setup, hardware and local road-use requirements. Not available for all configurations.

Submit for Review

Related Resources

BMW Pre-Tuning ChecklistStage 1 vs Stage 2 ExplainedWhen to Diagnose Before TuningBMW Petrol Tuning Guide

BMW N54 File Service

Order a file for your BMW 135i

Prepare the original ECU file, vehicle details, fuel and hardware setup before opening a file request.

Open File Service Portal

Original ECU File

Read via OBD, Bench or Boot

Vehicle Details

Model, year and specification

Fuel Information

Fuel type and octane rating

ECU Identification

Hardware and software version