Mercedes A45 AMG Remap
The Mercedes A45 AMG S produces a factory 421bhp from a 2.0-litre engine - the highest specific output of any production four-cylinder engine. Even at this level, ECU remapping still unlocks further performance: a Stage 1 remap takes the A45 S beyond 480bhp, making it one of the fastest front-biased hot hatches on the road. AutoCleanse provides A45 AMG remapping in Devon from our Totnes workshop.
Performance Gains
Mercedes A45 AMG Engine Options
2.0T M139 387 (A45, W177)
2.0T M139 421 (A45 S, W177)
Our Process
Professional ECU Tuning in Devon
Every remap we perform includes a full pre-tune diagnostic check to ensure your Mercedes is healthy before we start. We don't flash generic files - we use safe, proven calibrations tailored to your engine's specific hardware.
Mobile Remapping Available
We cover the entirety of Devon. We can remap your Mercedes A45 AMG at your home, workplace, or driveway, providing the same high-quality service as you'd receive in our workshop.
FAQ
Mercedes A45 AMG Remapping Questions
The A45 S at 421bhp typically reaches 480–490bhp at Stage 1 with no hardware changes. Combined with the Drift mode and 4MATIC+ AWD system, the remapped A45 S offers extraordinary performance that rivals cars costing twice the price.
The M139 is an exceptional engineering achievement and has a growing tuning history. At Stage 1 power levels it remains within proven limits. We strongly recommend using only reputable, proven maps - not generic files - on an engine of this calibre.
Stage 2 with an uprated intercooler and exhaust work can push the A45 S towards 550bhp. At these levels the DSG and drivetrain become limiting factors. Stage 1 at 485bhp is the sensible stopping point for a road car.
Yes - the 4MATIC+ Torque Vectoring rear differential continues to function as designed after remapping. If anything, the additional power makes the system's capabilities more apparent and engaging.
Yes - we remap A45 AMG models at our Totnes workshop. We recommend a workshop visit for performance vehicles of this calibre to allow for a proper road test on suitable roads after the remap.
Transform Your Mercedes Today.
Book your A45 in for a Stage 1 ECU remap. Choose between a workshop visit or a mobile appointment across Devon.
Safe, tested calibrations for long-term reliability