The later revision of the 2.5 TDi as per the T5 Transporter used a gear system instead of a conventional timing/belt chain, so at least this is one less problem to be on the look out for. Oil Pump Failure. Some owners have reported oil pump failure on the VAG 2.5 TDI engine, which can cause engine damage if left unattended.. Volkswagen Transporter (T5), 2004-2007 Volkswagen Touareg. VW 2.5-liter TDI PD Engine Problems and Reliability. The 2.5-liter TDI PD engines are not as durable as the previous version. But it is a pretty good engine and very reliable if you do the maintenance well (400-500k trouble-free miles). Some peoples had cylinder head and camshaft issues.

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The engines seem to last longer when they are thrashed daily and kept maintained well. Exhaust pressure sensor is a common problem on the 2.5 but they are £40 for the part and about 3/4 hour fitting at a dealer. Few issues with turbo's on them too, but i have found these mainly down to chipped engines.. Here is a list of their direct equivalent terminals to replace the VW repair wires that are the most commonly used: vw repair wire 000979131 = Terminal 3-8020 (used on w8 light; mini ISO connectors on MFD; oil sensor etc) 000979133 = 3-7209 (most terminals on car 1.0mm wire) 000979225 = 3-7212 (same as 000979133 but for 2.5mm wire)