Land Rover and Range Rover OBD-II Diagnostics: TDV6/TDV8, 2.0 Si4, EAS Air Suspension

Land Rover and Range Rover present unique diagnostic challenges. Full diagnostics requires Jaguar Land Rover’s (JLR) proprietary protocols, but OBD-II already delivers important information — especially for engine and EAS air suspension faults.

TDV6 3.0 (Discovery 4, Range Rover Sport): V6 Diesel

P0087 — Rail Pressure Below Threshold (TDV6)

The TDV6 3.0 is a Ford/Jaguar shared unit — essentially a Ford 3.0 TDCi with JLR-specific calibration.

Causes:

• Siemens Continental HP pump after 120,000 km — plunger wear
• Clogged fuel filter (LR recommends 30,000 km intervals, but often skipped)

Live Data:

• Rail Pressure Actual at idle: normal 230–280 bar
• Fuel Pump Regulator Duty Cycle: > 90% at idle → pump can’t meet demand

P0299 — TDV6 Underboost

Cause: Carbon deposits on VGT turbo vanes.

• VGT Vane Position stuck in one position
• Boost Pressure Target vs Actual at 2,500 RPM: difference > 40 kPa → turbo not responding

Solution: VGT actuator and vane cleaning; severe cases — turbo rebuild/replacement.

P2002 — DPF Efficiency Below Threshold

TDV6 Discovery 4 is sensitive to urban use:

• Short journeys (< 10 km) → DPF never reaches regeneration temperature
• DPF Differential Pressure > 12 kPa → forced regeneration required

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TDV8 4.4 (Range Rover L322, Sport): V8 Diesel

P0016 — TDV8 Timing Chain

The TDV8 4.4 (BMW N74-derived) has a long timing chain with known tensioner issues.

Symptoms:

• Metallic rattle on cold start (5–15 seconds)
• P0016/P0017 at 80,000–120,000 km mileage

Live Data:

• Camshaft Phase Error Bank 1/2: > 8° → chain or tensioner fault
• Both banks simultaneously → central cross-bank chain issue

P0087 — TDV8 Rail Pressure

TDV8 is sensitive to fuel quality:

• Bosch CP4.1 or CP3 depending on generation
• Poor quality diesel: Rail Pressure Actual below 350 bar → check filter first

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2.0 Si4 / Ingenium (Range Rover Evoque, Discovery Sport)

JLR’s own four-cylinder turbocharged petrol engine (2014+).

P0299 — Ingenium Underboost

• Turbo actuator wears after 60,000 km
• Charge pipe between turbo and throttle body cracks

Live Data:

• Intake Manifold Pressure: at 2,000 RPM normal is 1.4–1.6 bar; lower → leak
• Wastegate Position vs Target: difference > 15% → actuator failure

P2187 — Lean Mixture Ingenium

Similar to other modern turbocharged petrol engines:

• PCV system and cam cover durability
• STFT B1 > +8% → confirms air leak

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EAS — Electronic Air Suspension (Range Rover Classic, L322, L405)

EAS (Electronic Air Suspension) is one of Range Rover’s most complex systems.

C1A25 / C1A26 — Air Suspension Valve Fault

Most common EAS codes:

• C1A25 — Front left air spring valve: fault
• C1A26 — Front right air spring valve: fault
• C1A27/C1A28 — Rear air springs similarly

Live Data EAS:

• Ride Height Front Left/Right: difference > 15 mm → spring leak or height sensor fault
• Air Compressor Running Time: > 5 min/cycle → air leaking somewhere in system
• Reservoir Pressure: normal 10–14 bar; < 8 bar → weak compressor or leaking valves

Typical EAS leak locations:

1. Air spring bellows (rubber cracks from cold or age)
2. Valve block under the bonnet — valve O-rings
3. Polyamide air lines — cracks at push-fit connectors

Key insight: EAS on Range Rover L322 after 10 years/100,000 km — leaks are almost guaranteed. Check Compressor Runtime — if the compressor runs every 15 minutes → trace the leak.

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Transfer Case and Terrain Response (4WD)

P1716 — Transfer Case Ratio Incorrect

Borg-Warner BW4417 transfer box (Discovery 4) and equivalents:

• Electronic Hi/Lo switch failure
• Shift fork wear

Live Data 4WD:

• Transfer Case Position Requested vs Actual: mismatch → electronic or mechanical fault
• Terrain Response Mode: Normal / Grass-Gravel-Snow / Mud-Ruts / Sand / Rock Crawl

P175F — Haldex: Low Pressure (Freelander 2, Discovery Sport)

Haldex AWD system fault:

• Haldex Pump Duty Cycle %: > 80% during normal driving → worn filter or clutch pack
• Haldex oil change every 40,000 km (JLR requirement)

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OBD-II Specifics for JLR

Jaguar Land Rover uses UDS/CAN with proprietary identifiers. Full diagnostics needs:

• JLR SDD (OEM tool) or IIDTool — for EAS calibration and 4WD service functions
• Via ELM327 Mode 22: basic engine PIDs, P/C/B/U codes
• EAS and Terrain Response — JLR Extended Mode only

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Summary: Land Rover / Range Rover

Model	Engine/System	Top Codes
Discovery 4	TDV6 3.0	P0087, P0299 VGT
Range Rover L322/Sport	TDV8 4.4	P0016 chain, P0087
Evoque/Discovery Sport	2.0 Si4 Ingenium	P0299, P2187
Range Rover (all)	EAS air suspension	C1A25–C1A28, leaks
Freelander 2	Haldex AWD	P175F, clutch pressure

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