Front O2 Sensor MHK100920 – Discovery II
The oxygen sensor is one of the most important emissions and engine management components in your Discovery Series II. Positioned upstream of the catalytic converter in the exhaust stream, the front O2 sensor continuously monitors exhaust gas composition and sends real-time feedback to the engine control unit. The ECU uses this data to adjust the fuel-to-air mixture, ensuring optimal combustion efficiency, fuel economy, and emissions compliance. A failing front oxygen sensor can cause rough idling, increased fuel consumption, a lit check engine light, and failed emissions testing. Replacing your oxygen sensor promptly restores the precision your Land Rover's engine management system depends on to run cleanly and efficiently.
This is a front, pre-catalyst sensor compatible with the OBD2 diagnostic system fitted to Discovery Series II vehicles. Two sensors are required per vehicle, one for each exhaust bank, so please confirm whether you are replacing one or both before ordering.
Fits:
- Discovery Series II 4.0-liter V8 Petrol/Gas
- Discovery Series II 4.6-liter V8 Petrol/Gas
No supersessions found.
FAQ
Will this sensor fit both the 4.0-liter and 4.6-liter Rover V8 engines in the Discovery Series II L318?
Yes. Part number MHK100920 is compatible with both the 4.0-liter and 4.6-liter Rover V8 petrol/gas engines fitted to the Discovery Series II L318 produced from 1999 to 2004. Always confirm your specific engine designation before installation if you are unsure.
How many oxygen sensors does my Discovery Series II require, and is this the front or rear sensor?
The Discovery Series II uses multiple oxygen sensors in the exhaust system. MHK100920 is specifically the front, pre-catalyst OBD2 sensor. Two of these front sensors are required per vehicle, one per bank. Be sure to confirm how many you need before ordering.
What does the front oxygen sensor actually do, and how do I know when it needs replacing?
The front oxygen sensor monitors exhaust gas composition before the catalytic converter and feeds that data to the ECU, which uses it to continuously adjust the fuel-to-air mixture. Common signs of a failing sensor include a check engine light, reduced fuel economy, rough idling, and failed emissions testing. Replacing the sensor restores proper engine management function and keeps your Discovery running as intended.
The oxygen sensor is one of the most important emissions and engine management components in your Discovery Series II. Positioned upstream of the catalytic converter in the exhaust stream, the front O2 sensor continuously monitors exhaust gas composition and sends real-time feedback to the engine control unit. The ECU uses this data to adjust the fuel-to-air mixture, ensuring optimal combustion efficiency, fuel economy, and emissions compliance. A failing front oxygen sensor can cause rough idling, increased fuel consumption, a lit check engine light, and failed emissions testing. Replacing your oxygen sensor promptly restores the precision your Land Rover's engine management system depends on to run cleanly and efficiently.
This is a front, pre-catalyst sensor compatible with the OBD2 diagnostic system fitted to Discovery Series II vehicles. Two sensors are required per vehicle, one for each exhaust bank, so please confirm whether you are replacing one or both before ordering.
Fits:
- Discovery Series II 4.0-liter V8 Petrol/Gas
- Discovery Series II 4.6-liter V8 Petrol/Gas
No supersessions found.
FAQ
Will this sensor fit both the 4.0-liter and 4.6-liter Rover V8 engines in the Discovery Series II L318?
Yes. Part number MHK100920 is compatible with both the 4.0-liter and 4.6-liter Rover V8 petrol/gas engines fitted to the Discovery Series II L318 produced from 1999 to 2004. Always confirm your specific engine designation before installation if you are unsure.
How many oxygen sensors does my Discovery Series II require, and is this the front or rear sensor?
The Discovery Series II uses multiple oxygen sensors in the exhaust system. MHK100920 is specifically the front, pre-catalyst OBD2 sensor. Two of these front sensors are required per vehicle, one per bank. Be sure to confirm how many you need before ordering.
What does the front oxygen sensor actually do, and how do I know when it needs replacing?
The front oxygen sensor monitors exhaust gas composition before the catalytic converter and feeds that data to the ECU, which uses it to continuously adjust the fuel-to-air mixture. Common signs of a failing sensor include a check engine light, reduced fuel economy, rough idling, and failed emissions testing. Replacing the sensor restores proper engine management function and keeps your Discovery running as intended.
Original: $68.91
-65%$68.91
$24.12Description
The oxygen sensor is one of the most important emissions and engine management components in your Discovery Series II. Positioned upstream of the catalytic converter in the exhaust stream, the front O2 sensor continuously monitors exhaust gas composition and sends real-time feedback to the engine control unit. The ECU uses this data to adjust the fuel-to-air mixture, ensuring optimal combustion efficiency, fuel economy, and emissions compliance. A failing front oxygen sensor can cause rough idling, increased fuel consumption, a lit check engine light, and failed emissions testing. Replacing your oxygen sensor promptly restores the precision your Land Rover's engine management system depends on to run cleanly and efficiently.
This is a front, pre-catalyst sensor compatible with the OBD2 diagnostic system fitted to Discovery Series II vehicles. Two sensors are required per vehicle, one for each exhaust bank, so please confirm whether you are replacing one or both before ordering.
Fits:
- Discovery Series II 4.0-liter V8 Petrol/Gas
- Discovery Series II 4.6-liter V8 Petrol/Gas
No supersessions found.
FAQ
Will this sensor fit both the 4.0-liter and 4.6-liter Rover V8 engines in the Discovery Series II L318?
Yes. Part number MHK100920 is compatible with both the 4.0-liter and 4.6-liter Rover V8 petrol/gas engines fitted to the Discovery Series II L318 produced from 1999 to 2004. Always confirm your specific engine designation before installation if you are unsure.
How many oxygen sensors does my Discovery Series II require, and is this the front or rear sensor?
The Discovery Series II uses multiple oxygen sensors in the exhaust system. MHK100920 is specifically the front, pre-catalyst OBD2 sensor. Two of these front sensors are required per vehicle, one per bank. Be sure to confirm how many you need before ordering.
What does the front oxygen sensor actually do, and how do I know when it needs replacing?
The front oxygen sensor monitors exhaust gas composition before the catalytic converter and feeds that data to the ECU, which uses it to continuously adjust the fuel-to-air mixture. Common signs of a failing sensor include a check engine light, reduced fuel economy, rough idling, and failed emissions testing. Replacing the sensor restores proper engine management function and keeps your Discovery running as intended.
