Jetta TDI Engine Knock + Oil Warning Points to Bad Bearings

Having experienced similar symptoms with my 2010 VW Passat TDI, this sounds like a potentially serious issue that needs immediate attention. The combination of knocking sounds and oil pressure warnings typically indicates problems beyond just a faulty oil pressure sensor. Last time at the garage, diagnosis revealed my oil pump was failing, causing inconsistent oil pressure. This led to inadequate lubrication of engine bearings, which explained the knocking sounds. The oil pressure sensor readings were accurate, not faulty, and were warning of a real problem. The repair required removing the oil pan, replacing the oil pump assembly, and inspecting engine bearings for damage. Due to catching it early, the bearings hadnt sustained major wear. However, continuing to drive with these symptoms risks catastrophic engine damage. When the oil pump fails, engine oil doesnt circulate properly, regardless of proper oil level or recent oil changes. The knocking sound often indicates oil starvation at critical engine components. Would strongly recommend avoiding driving the vehicle until properly diagnosed. This isnt a repair to postpone, as insufficient oil pressure can destroy an engine within minutes of operation.

Thanks for sharing that detailed explanation. Had the exact same issue with my 2013 Jetta two years ago, knocking noise and low oil pressure warnings. The oil pump replacement was indeed the culprit, plus they found some wear on the engine bearings due to oil leakage around the seals. Did you track how much the full repair ended up costing you? Just curious since prices vary and it might help others gauge repair costs. Also wondering if you experienced any related issues since the fix? My engine oil consumption stayed slightly higher than normal for a few months after the repair, but eventually normalized.

Good to hear you had similar symptoms and got it resolved. After my oil pump repair in the Passat, everything has been running perfectly with normal oil pressure. The repair totaled 755€, which included replacing the faulty oil pump and checking all engine bearings for wear. No oil consumption issues or knocking sounds since the fix. The root cause was poor oil circulation causing intermittent low oil pressure, but catching it early prevented major engine bearing damage. A clogged oil filter was also replaced during the service as a precaution. The oil viscosity recommendations were adjusted slightly to help protect against future oil pressure drops. Two years later and over 40000km, the engine still maintains proper oil pressure with no warning lights or unusual noises. Regular oil changes with the correct viscosity grade have kept everything running smoothly since the repair.

Took my Jetta to a new mechanic after researching recommendations online. The total repair came to 890€, including parts and labor for the oil pump replacement. They found moderate wear on two engine bearings that needed attention, which added to the cost. Still cheaper than risking complete engine failure. The shop completed everything in 3 days and showed me the old worn parts. Pretty obvious why the engine was making those awful knocking sounds, the oil pump shaft had significant wear causing pressure loss. They also replaced the oil filter since it was partially clogged with metal particles. After 6 months and 15000km, the engine runs perfectly with steady oil pressure. No more warning lights or strange noises. Keeping up with regular oil changes using the recommended viscosity. Much better experience with this mechanic compared to previous shops, they took time explaining the issues and showing the damaged components.