Catalytic Converter / Lambda Sensor / O2 Sensors — Reprogramming Solutions
19
codes with a fix
< 1 h
file delivery
The catalyst and the lambda (O2) probes They form the main emissions control system in gasoline engines. The three-way catalytic converter converts harmful gases (CO, HC, NOx) into less harmful gases, while the lambda sensors measure the oxygen concentration in the exhaust so that the ECU can adjust the air-fuel mixture.
Each bank of the engine has two sensors: the pre-catalytic converter sensor (upstream, sensor 1) regulates the fuel mixture, and the post-catalytic converter sensor (downstream, sensor 2) monitors catalytic efficiency. When the ECU compares both signals and detects insufficient conversion, it generates codes such as P0420—one of the most common DTCs worldwide.
Common causes include: degraded or poisoned catalytic converter due to end-of-life, installation of a sport catalytic converter or decatalysis, worn-out or erratic lambda sensors, exhaust leaks, and mixture problems that accelerate catalytic deterioration.
The remapping solution makes it possible to disable post-catalyst sensor monitoring and the associated DTCs while keeping mixture control intact. It is especially useful after fitting a sports catalytic converter or on competition vehicles. These are the catalytic converter and lambda codes we solve:
P0420 — Catalytic converter efficiency below threshold — Bank 1. The ECU...
CAT OFF + Lambda OFF + DTC OFFP0430 — Catalytic converter system efficiency below threshold — Bank 2. Same day...
CAT OFF + Lambda OFF + DTC OFFP0136 — Oxygen Sensor Circuit — Bank 1 Sensor 2 (Rear Lambda Sensor).
Rear Lambda OFF + DTC OFFP0141 — Oxygen Sensor Heater Circuit — Bank 1 Sensor 2. The ECU detects...
Rear Lambda OFF + DTC OFFP0421 — Heating catalyst efficiency below threshold — Bank 1. ...
CAT OFF + Lambda OFF + DTC OFFP0036 — Oxygen Probe Heater Control Circuit — Bank 1 Sensor 2....
Rear Lambda OFF + DTC OFFP0137 — Low Oxygen Sensor Voltage — Bank 1 Sensor 2. The probe signal...
Rear Lambda OFF + DTC OFFP0138 — Oxygen sensor high voltage — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0422 — Main catalyst efficiency below threshold — Bank 1.
CAT OFF + Lambda OFF + DTC OFFP0037 — HO2S Heater Circuit Low — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0038 — Heater Circuit HO2S High — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0139 — Slow Oxygen Sensor Response — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0140 — Oxygen sensor no activity detected — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0423 — Heated catalyst efficiency below threshold — Bank 1.
CAT OFF + Lambda OFF + DTC OFFP2270 — O2 sensor signal stuck in lean mixture — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP2271 — O2 sensor signal stuck in rich mixture — Bank 1 Sensor 2.
Rear Lambda OFF + DTC OFFP0424 — Heated catalyst temperature below threshold — Bank 1.
CAT OFF + DTC OFFP0428 — Catalytic Converter Temperature Sensor High — Bank 1.
CAT OFF + DTC OFFP0431 — Heating catalyst efficiency below threshold — Bank 2.
CAT OFF + Lambda OFF + DTC OFFAre you a professional workshop?
Request your ECU reprogramming file. Professional service with delivery in less than 1 hour.
Other systems with a solution through reprogramming
Modifications to emission control systems (EGR, DPF, AdBlue, catalyst…) are offered exclusively for competition use, off-road use or in markets where regulations allow it. The professional workshop installing the file is responsible for complying with applicable law.
