Lambda & CAT Sensor Delete Leicester – Stop Emissions Faults After Decats
ECU-Level O2 Sensor Removal for Decatted or Modified Exhausts
Fitted a decat or sports cat and now stuck with warning lights or MOT-style emissions faults? Our Lambda & CAT sensor delete Leicester service disables rear O2 sensor monitoring at ECU level — stopping the MIL light, avoiding limp mode, and removing post-cat fault codes.
Perfect for modified exhausts, track builds, and off-road use. We’re fully mobile across Leicester, Loughborough, Hinckley, Coalville, and surrounding towns.
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Please include Make, Model and Vehicle reg
What You Get from a Lambda/CAT Sensor Delete
If you’ve fitted a decat pipe or high-flow sports cat, your post-cat O2 sensor will likely throw up fault codes and warning lights. Our ECU-level Lambda sensor delete switches off rear sensor monitoring — so the car stops trying to adjust for a missing or inefficient catalyst.
- Disables post-cat O2 sensor – no P0420/P0430 catalyst efficiency faults
- Stops warning lights and emissions-related limp mode
- Prevents fuel trims from fluctuating due to sensor errors
- Fully software-based – no resistor tricks, no emulators, no fault codes
- Compatible with decats and sports cats
- Mobile service across Leicestershire – we come to you
Is My Vehicle Suitable for a Lambda Sensor Delete?
If your car has been decatted or fitted with a high-flow cat, and the rear O2 sensor is triggering fault codes or warning lights, then yes — you're a perfect candidate for this service.
We regularly carry out Lambda/CAT sensor deletes on:
- VW Golf GTI, R, TDI, and other EA888 or PD/CR platforms
- BMW N54/N55/B58 engines after sports exhaust installs
- Ford ST/RS Ecoboost models with decats or downpipe mods
- Vauxhall VXRs, Astra GTC, Insignia post-cat tuning
- Audi, SEAT, Skoda Cupra models running sports cats
- MINI Cooper S, JCW, and custom builds with full exhaust swaps
Not sure? Send us your reg and we’ll confirm if we can disable the rear sensor cleanly via ECU software.
📍 Check My VehicleWhy Choose Leicester Remaps for Lambda Deletes?
- ECU-level calibration – not cheap emulators or resistors
- No MIL lights, limp mode or running issues – clean deletes with diagnostics before and after
- Ideal for decatted and track-modified cars
- Custom files only – every sensor delete is tuned to your specific ECU software
- Mobile service across Leicestershire – home, workshop, or unit visits
- Proven results – 100s of happy customers with decat setups now fault-free
Real Results – Lambda Delete on a BMW 135i
BMW 135i N55 – downpipe and sports cat fitted, throwing P0420 fault repeatedly
- Before: Constant emissions fault light, fluctuating fuel trims, failed MOT
- After: ECU-level Lambda delete, no fault codes, smooth power delivery
- ✔ Custom file written for sports cat setup
- ✔ Mobile visit to customer’s workshop in Coalville
- ✔ Full pre/post diagnostics run and confirmed sensor deactivation
This customer upgraded their exhaust system and kept getting check engine lights despite proper fitment. We disabled the rear sensor’s monitoring through the ECU — no lights since, full drivability, and ready for track use.
Book Your Lambda Sensor Delete Today
Fitted a decat or sports cat and sick of warning lights? We’ll remove rear sensor monitoring via ECU — no limp mode, no P0420, no hassle.
We’re fully mobile across Leicester, Hinckley, Loughborough, and nearby. Fast, clean, and fully fault-free.
📍 Request a Callback 📞 Call 07849 475153Frequently Asked Question
We now have an FAQ list that we hope will help you answer
some of the more common ones.
The front sensor (pre-cat) measures air/fuel mixture and is essential for engine performance. The rear sensor (post-cat) checks if the catalytic converter is doing its job. Our delete only disables the rear sensor monitoring — performance is unaffected.
Spacers and emulators are temporary fixes and often cause inconsistent results or warning lights. Our ECU-based solution disables the sensor function properly — no more fault codes, no MOT surprises (off-road only).
No — in fact, your engine will likely run more smoothly without the ECU constantly trying to correct for a missing or “inefficient” catalyst. Fuel trims stay stable, and you avoid unnecessary power dips or dash lights.
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About us
Welcome to Leicester Remaps, where ordinary vehicles become extraordinary driving experiences. Our expert team offers tailored remapping services to optimize performance, efficiency, and longevity.