TD5 Sensors for Defender & Discovery 2
TD5 sensors for Defender and Discovery 2, including MAF, MAP, ambient air pressure, crankshaft position, coolant temperature, oil pressure and vehicle-specific water-in-fuel sensors.
Start with the diagnostic results and the sensor being tested, then match the part number, connector and vehicle fitment. Standard replacement sensors, branded alternatives and the 4-bar MAP sensor serve different jobs; the 4-bar sensor is only for TD5 ECUs calibrated for it.
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Find the right TD5 sensor
TD5 sensor faults can produce overlapping symptoms, including poor starting, cutting out, reduced performance, smoke, incorrect boost control and implausible live-data readings. Use diagnostic fault codes and live data alongside wiring and connector checks before replacing the sensor being tested.
| Fault or system | Best place to start | Check before ordering |
|---|---|---|
| Crank/no-start or intermittent cut-out | Crankshaft position sensor | Sensor part number, connector and loom condition; Lucas and PR2 replacement versions are available |
| Airflow and fuelling readings | MAF / mass air flow sensor | Part number and brand; Delphi, Lucas, Genuine Land Rover and selected replacement versions are shown |
| Manifold pressure and boost readings | Standard MAP / manifold pressure sensor | Standard replacement or 4-bar sensor, plus the ECU calibration used on the vehicle |
| Ambient pressure readings | AAP / ambient air pressure sensor | Sensor type, part number and connector; MHK100820L is the later 4-pin variant |
| Coolant temperature readings | TD5 coolant temperature sensor | Original reference and preferred brand; Lucas and Genuine Bosch versions are available |
| Oil pressure warning circuit | Oil pressure switch | Part number and confirmation that the switch or its wiring is causing the warning fault |
| Water-in-fuel warning | Fuel filter housing water sensor | Defender or Discovery 2 fitment, as the two vehicles use different sensor references |
| Modified cone-filter intake | AAP sensor mounting housing | Intake layout and confirmation that a mounting housing rather than a replacement sensor is required |
Check TD5 sensor fitment before ordering
MAP, MAF or AAP
These sensors measure different information. The MAP sensor reads manifold pressure, the MAF sensor measures intake airflow and the AAP sensor reads atmospheric pressure.
These sensors measure different information. The MAP sensor reads manifold pressure, the MAF sensor measures intake airflow and the AAP sensor reads atmospheric pressure.
Part number and connector
Match the original part number and connector before ordering, particularly where early, late or 4-pin sensor variants are stated.
Match the original part number and connector before ordering, particularly where early, late or 4-pin sensor variants are stated.
Defender or Discovery 2
Most engine-mounted TD5 sensors fit both vehicles, but the Defender and Discovery 2 water-in-fuel sensors are different parts.
Most engine-mounted TD5 sensors fit both vehicles, but the Defender and Discovery 2 water-in-fuel sensors are different parts.
Standard or 4-bar MAP
The 4-bar MAP sensor is an uprated tuning component and requires an ECU map calibrated for its pressure scaling. It is not a standard replacement MAP sensor.
The 4-bar MAP sensor is an uprated tuning component and requires an ECU map calibrated for its pressure scaling. It is not a standard replacement MAP sensor.
TD5 sensor brands and quality levels
Sensor quality and signal accuracy matter on an electronically controlled TD5 engine. Individual product pages identify the manufacturer, Genuine status where confirmed, replacement reference and any tuning or connector requirements.
| Sensor type | How it is shown on Twinwoods 4x4 |
|---|---|
| Genuine Land Rover | Factory-branded sensors are identified as Genuine Land Rover on the individual product page. |
| Bosch, Lucas and Delphi | Branded sensor choices are identified by manufacturer, part number and exact sensor function. |
| Selected replacement | Other replacement sensors are described by their fitment, reference and quality level without unsupported OEM claims. |
| Uprated sensor parts | Performance parts such as the 4-bar MAP sensor are identified separately and include the required tuning or installation conditions. |
Related TD5 sensor sections
| Section | Use it for |
|---|---|
| TD5 MAF sensors | Compare the available mass air flow sensor brands and quality levels. |
| TD5 crank sensors | Compare crankshaft position sensors and the related wiring repair route. |
| Uprated TD5 sensors | 4-bar MAP sensors and supporting sensor parts for modified TD5 intake and boost setups. |
| Defender TD5 engine sensors | Engine-management sensors grouped within the Defender TD5 engine section. |
| Discovery 2 TD5 engine sensors | Engine-management sensors grouped within the Discovery 2 TD5 engine section. |
