TDV6 / SDV6 vs 1.9 dCi: which engine is more reliable?

According to our risk index, the TDV6 / SDV6 carries less risk than the 1.9 dCi: 46/100 (moderate risk) versus 67/100 (high risk). The TDV6 / SDV6 has 2 documented serious faults, the main one being «Crankshaft breakage and spinning main bearing shells»; the 1.9 dCi has 3 documented serious faults, the main one being «Seizure and wear of the big-end bearings».

Risk index

TDV6 / SDV6

Moderate risk · 2 serious faults

Lower risk

Risk index

1.9 dCi

High risk · 3 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

Reviewed on 5 October 202613 sources How we work

Is the TDV6 / SDV6 reliable?

The Land Rover and Jaguar TDV6/SDV6 diesel V6 engines, shared with Peugeot and Citroën, have a serious documented fault: crankshaft and main bearing shells on the 3.0, and the belt-driven oil pump on the 2.7. Insist on a service history and weigh up the repair cost before buying.^[1][2][3]

See the 3 of the TDV6 / SDV6 faults

Is the 1.9 dCi reliable?

The 1.9 dCi (F9Q) was Renault's first common-rail diesel (1999) and powered a large part of its range, and those of Nissan and Volvo, for more than a decade. It has well-documented weak points: on versions of up to 120 hp built before 2005, the big-end bearings can seize and the turbo tends to degrade around 150,000 km; the injectors, the EGR valve and, on the 120 hp versions, the dual-mass flywheel also fail fairly often.^{[4][5][6][7][8]}

See the 5 of the 1.9 dCi faults

Side-by-side comparison

Comparison of TDV6 / SDV6 and 1.9 dCi
Item	TDV6 / SDV6	1.9 dCi
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,720 cm³	1,870 cm³
Timing	Wet belt (belt-in-oil)	Timing belt (dry)
Power	188–302 hp	80–130 hp
Production	2004–2018^[9]	1999–2011^[10][11][12]
Reliability
Risk index (what is it?)	46Moderate risk	67High risk
Documented faults	3	5
Of high or critical severity	2	3
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Crankshaft breakage and spinning main bearing shells Critical severity: Broken oil pump housing and timing belt jumping on the 2.7 Medium severity: Turbo and pneumatic actuator failure on the 3.0 TDV6/SDV6	Critical severity: Seizure and wear of the big-end bearings High severity: Premature turbocharger wear High severity: Failures of the Delphi direct-injection injectors
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	2.7 TDV6 (276DT/DT17, 2004-2010)^[3][13] 3.0 TDV6/SDV6 (306DT, 2009-2018)^[1][2]	1.9 dCi 95-120 (F9Q, first generation, 1999-2005)^[6] 1.9 dCi 125-130 (F9Q, Energy dCi, 2005-2011)^[6] 1.9 dCi 80-101 (F9Q, vans and commercial vehicles, 1999-2007)^[4][5]
AvoidVersions to avoid	None	None

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

TDV6 / SDV6

See the 15 models with the TDV6 / SDV6

1.9 dCi

See the 13 models with the 1.9 dCi

Other comparisons

With the TDV6 / SDV6

With the 1.9 dCi

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Sources

Every fact on this page links to its source. If you find an error, let us know.

Land Rover Discovery TDV6 engine failures making headlinesLandyOnline · Other source · published October 2015 · consulted 5 October 2026
Land Rover & Jaguar SDV6/TDV6 Crankshaft RepairJLR Engines · Technical documentation · consulted 5 October 2026
Land Rover 2.7 TDV6 Timing Belt Replacement GuideBudget Parts (roverparts.eu) · Technical documentation · consulted 5 October 2026
Renault Mégane II (2002 – 2009): Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Renault Scénic II (2003 – 2009) – Typische Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Achat d'occasion : faut-il éviter le moteur 1.9 dCi F9Q chez Renault ?Planète Renault · Motoring press · published 24 January 2024 · consulted 27 September 2026 · in French
Diesels : volant moteur défectueuxFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Vanne EGR : problèmes et pannesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Ford AJD-V6/PSA DT17 engineWikipedia · Other source · consulted 5 October 2026
Renault F-Type engineWikipedia · Other source · consulted 27 September 2026
Moteur F RenaultWikipédia · Other source · consulted 27 September 2026 · in French
Renault Espace IVWikipedia · Other source · consulted 27 September 2026 · in German
TdV6 Timing BeltLes Richmond Automotive (lrautomotive.com.au) · Technical documentation · consulted 5 October 2026