Lambda/O2 Solution | Removal | DECAT


When decatting a petrol vehicle it is likely an engine management light will be illuminated and a fault code for cat efficiency will be stored inside the ECU memory. By careful recalibration of the Engine Control Unit (ECU) data, Quantum Tuning’s ECU Tuning Files Service offers the solution to disable or delete the function of the lambda OR O2 sensor within legal limitations

DECAT is the process of removing the O2 sensors from the exhaust system. This can be done by physically removing the sensors, When O2 sensors are removed, the ECU needs to be remapped to compensate for the change. This is because the ECU will no longer be receiving signals from the O2 sensors. The remap will typically adjust the fuel and timing maps to compensate for the lack of O2/Lambda sensors.

How It Works?

1. O2 Sensor or Lambda Sensor Removal:

  • The O2 sensor or lambda sensor is typically located before and after the catalytic converter in the exhaust system.
  • These sensors monitor the level of oxygen in the exhaust gases and provide feedback to the ECU to adjust the air-fuel mixture for optimal combustion and emissions.
  • During this modification, one or both of these sensors are removed or disabled.

2. Decat Pipe Installation:

  • A decat pipe is installed in place of the catalytic converter(s). This pipe is often straight through and lacks the catalytic material that would otherwise reduce emissions.
  • The decat pipe allows for less restrictive exhaust flow, potentially improving engine performance and sound.

3. ECU Tuning or Remapping:

  • After removing or disabling the O2 sensor(s) and installing the decat pipe, the vehicle’s ECU is typically remapped or reprogrammed.
  • The ECU tuning adjusts various engine parameters to account for the increased exhaust flow and the absence of the catalytic converter(s).
  • Changes in the tuning may include adjustments to fuel injection timing, air-fuel ratios, and potentially other performance-related settings.

Top Reasons for O2/Lambda Removal with Decat and ECU Tuning

  1. Performance: The removal of the catalytic converter and adjustment of engine parameters can potentially lead to improved engine performance, as it reduces exhaust system restriction.
  2. Sound: Many enthusiasts seek a more aggressive exhaust note, and a decat pipe can often provide this by allowing for freer exhaust flow.

If you are considering DECAT with ECU tuning, it is important to weigh the risks and benefits carefully. It is also important to choose a Certified ECU Tuner who has experience with this type of modification.

Things You Should Consider

  • Legal and Environmental Regulations: Removing or disabling catalytic converters is illegal in many places due to emissions regulations. It can result in significant fines and penalties.
  • Emissions: This modification significantly increases emissions, contributing to air pollution. It’s crucial to consider the environmental impact.
  • Warranty: This modification can void your vehicle’s warranty, so it’s essential to understand the implications for warranty coverage.
  • Engine Health: ECU tuning should be done carefully to ensure that the engine operates within safe parameters. An overly aggressive tune can lead to engine damage or reliability issues.
  • Professional Installation: O2 / lambda removal, decat installation, and ECU tuning should be performed by Quantum Tuning Certified Dealer who understand the implications of these modifications on your specific vehicle.

Quantum Tuning tune over 4000 vehicles a month with 1000+ approved dealers in 90+ different countries. Don’t have a ecu tuning tool? We can supply the latest ecu remapping tools, at great prices, from the market leaders. They are available in slave or master versions.

Quantum Tuning offers the solution by overwriting the existing settings within legal limitations of a vehicle’s Engine Control Unit (ECU) to improve several areas of the vehicle’s performance. This is not legal advice and if you are unsure if this applies to your vehicle, please seek further advice.

Qunatum Tuning Dealership    Chip Tuning Files