VW Tiguan Diesel Timing Issue Causing Poor Performance

Recently dealt with similar symptoms on a 2014 VW Passat TDI. The engine light signaled crankshaft position sensor issues, which caused poor engine synchronization and performance problems. Initial checks revealed timing chain wear affecting the crankshaft to camshaft synchronization. When the timing chain stretches, it disrupts proper engine timing, leading to sluggish performance and increased fuel consumption. The crank sensor was sending incorrect signals, making the engine management system adjust timing incorrectly. The complete repair required: Replacing the timing chain assembly, Installing a new crankshaft position sensor, Updating the engine control module This was definitely a serious repair requiring specialized diagnostic equipment. The symptoms match yours exactly, poor performance, engine light, and increased fuel usage. Without proper repair, these issues can lead to significant engine damage. Suggest having the timing chain and crank sensor tested. The engine synchronization problems often start with these components in VW TDI engines around 100000-120000km. Getting it fixed early prevents more extensive engine repairs later.

Thanks for sharing your experience. Sounds exactly like what I am dealing with on my Tiguan. The engine light keeps coming on and my mechanic also suspects timing chain issues affecting the camshaft timing. Did you remember roughly how much the full repair ended up costing? Also curious if you have had any recurring issues since the timing chain and crank sensor replacement was done? My mechanic quoted a significant amount but I want to make sure I am not overpaying for this type of work. The fuel consumption and sluggish performance is really concerning me, so I am leaning towards getting it fixed soon before it causes more damage.

Good news, after getting the crankshaft sensor replaced and properly calibrating the crankshaft to camshaft reference values, my VW has been running perfectly for the past 8 months. The engine performance returned to normal and fuel consumption dropped back to standard levels. The total repair came to 340€ for the crankshaft sensor replacement at my trusted workshop. This was significantly less than the full timing chain replacement I initially thought I needed. The engine synchronization issues were actually caused by the faulty crank sensor sending incorrect signals to the ECU. The timing belt and other components checked out fine during inspection, so no additional work was required. Since the repair, the engine light has stayed off and performance has remained strong. The engine runs smoothly with proper crankshaft timing now. If your symptoms are similar, definitely have them check the crank sensor first before jumping into more extensive timing chain work. The sensor issue can mimic timing chain problems but costs much less to fix. Getting it diagnosed properly saved me from unnecessary repairs.

Thanks for the helpful advice. Just wanted to update on what happened with my Tiguan. Took it to a different mechanic who specializes in VW engines. They ran a full diagnostic and found the crankshaft sensor was indeed failing, causing the timing issues. The repair ended up costing 390€ including parts and labor. They also inspected the timing chain while they were in there and confirmed it was still in good condition. The misfire problems and poor performance completely disappeared after the new cam sensor was installed and properly calibrated. Really glad I got a second opinion before agreeing to the much more expensive timing chain replacement the first shop recommended. The engine now runs perfectly smooth again with normal fuel consumption. No check engine light for the past few weeks either. Definitely worth getting these timing-related issues checked out early. The specialist mechanic mentioned waiting too long could have led to serious engine damage. Thanks again for pointing me in the right direction with the crankshaft sensor suggestion.