VW 3.0 TDI

[mikkhh]

On cars that do not have alternator free wheel clutch the crankshaft dampener is more important and it does not last as long on those that do not use free wheel clutch. I would seriously consider fitting (INA brand is fine and originals are INA too cost is like 30-40) one onto my own cars.

Yours may or may not have it, just a thing to look out for. I have no idea why some modern cars do not alternator free wheel clutches. They have been very reliable and usually fail after very long time, but there is way less load on the belt, tensioner and crankshaft dampener.

On some cars that have alternator free wheel pulley from factory that is absolutely mandatory stuff since belt is routed in a way that if alternator free wheel clutch locks up solid then serpentine belt will break because tensioner will jump so much that belt is going to hit itself and that is going to happen in a few minutes of driving. Worst case scenario is when you have a car that has got timing belt and then serpentine belt shreds get caught between timing belt sprocket and then there will jump of timing and it is going to cost an engine in case of V0lvos (rockers snapped, tappet sockets broken off in head, timing belt tensioner or idler pulley stud holes snapped off in engine block). BUT if you use genuine serpentine belt from dealer then those belt just snap off clean and do not create shreds.


Maf on diesel cars is not a critical part unlike on naturally aspirated ones. Most diesel cars use MAF at low rpm and check if EGR is working properly. Maf cleaner has yet to work in my case. B0sch sensor may work, but in my case maybe there is problems with supplier, but the last five differential pressure sensor on 2.0tdi have all been faulty. After replacing you need to have ignition on, engine stopped and then learn the offset for diffrerential pressure sensor, the cheaper B0sch sensors I have tried lately every single one is not adapting since the sensor is reading way off for that adaption to allow it to be zeroed out. If you have to buy second one and deal with warranty that saga already costs more than original sensor from dealer. All the original ones have worked so far. If you want to save money you could use older part code original new old stock, at least on 2.0tdi case. On those commonrail 2.0tdi there are two options for buying diff pressure sensor, one option is just the sensor, second is sensor with bracket and pipes going to dpf, latter one costs like 300 from dealer, fist one is like 70-100. BUT the more expensive one has got old revision sensor on it that could be had separately for like 30-40, just a little bit more than B0sch. That newer sensor has B0sch codes on it too, BUT it is not sold as aftermarket part anywhere.

Same story with vitesco (owned by schaeffler, continental) sensors (MAF, nOx etc) they are only sold as genuine part from dealer with car manufacturer logos, they are not sold as aftermarket part. Maybe if revisions are updated old revision stuff will get passed on to some packagers that sell those things aftermarket, but you never know if the part is sold as no name due to it failing quality control or just being old revision.