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BMW · Stage 1

BMW E91 325i Touring Stage 1 & NOx Sensor Fix

A mobile Stage 1 calibration by MTechTuning, with dealer-level diagnostics before and after tuning.

Published vehicle figures

Stock

215hp

270Nm

Stage 1

265hp

315Nm

Difference

+50hp

+45Nm

Figures published for this vehicle. Results vary with model year, software, fuel and condition, so we confirm what suits your car before quoting.

BMW E91 325i Touring Stage 1 & NOx Sensor Fix

This BMW E91 325i Touring went from 215hp and 270Nm to 265hp and 315Nm with our Stage 1 calibration, and we sorted its NOx sensor issues on the same visit.

Tuning and a fault fix together

The car was in for maintenance, so we tuned it to Stage 1 and dealt with the NOx sensor faults at the same time. It now runs cleanly and feels noticeably livelier.

Add-ons

  • Speed limiter solution
  • NOx sensor fix

Can you fix faults and tune on the same day?

Yes. We diagnose first with dealer-level equipment and fix what we find before tuning. We cover Bristol, North Somerset, Somerset and South Wales.

About this job

The results

From 215hp as standard to 265hp, the BMW E91 325i Touring gained 50hp, roughly 23% more power.

Torque rose from 270Nm to 315Nm (+45Nm), which is what you feel most in everyday driving: stronger pull from low revs and easier overtaking.

What the work involved

This was a Stage 1 calibration: no hardware changes, just carefully refined engine software. Boost, fuelling, timing and torque limits are adjusted within safe margins for more usable performance every day.

How we carried it out

  • Diagnostic scan for stored faults before any work
  • Stabilised power supply connected while programming
  • Original software read and saved, so the car can be returned to standard
  • Calibration written, then the car checked again afterwards

Thinking about the same for your BMW?

We come to you from our Weston-super-Mare base, across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset. Results depend on the exact car, so we confirm what suits yours before quoting.

BMW 320i and 330i tuning Check your gains
BMW E91 325i Touring Stage 1 & NOx Sensor Fix photographed by MTechTuning
  • Dealer-level diagnostics before and after
  • Fully mobile, at home or work
  • Lifetime software warranty and support
  • 14-day money-back guarantee

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Talk through your vehicle

Find out what your car can do.

Share your registration, mileage and what you would like to improve. We're always online to quote and reply, and we'll confirm what is suitable before booking, then come to you. Fully mobile from our Weston-super-Mare base across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset.

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