VW Amarok VANOS Timing Fault Drains Gas Fast & Flashes CEL

Had a similar situation with my 2015 VW Passat 2.0 TSI. The flashing check engine light combined with high fuel consumption pointed to an engine misfire caused by a faulty inlet camshaft VANOS solenoid. The symptoms match exactly what you describe, erratic idle, increased fuel usage, and intermittent power loss. Initial diagnostic showed fault codes related to the variable timing system. The root cause was a defective VANOS solenoid, which was affecting camshaft timing and causing the engine to run rich. This is a serious issue that needs prompt attention, as continued driving can damage the catalytic converter and lead to more extensive engine problems. The repair involved replacing both the inlet camshaft VANOS solenoid and the wiring harness due to some deterioration. The job typically requires specialized diagnostic equipment to properly test the VANOS system operation. A proper repair includes checking both solenoids, the oil pressure, and verifying the timing after replacement. Testing should also include monitoring live data from the camshaft position sensors to ensure proper operation. This is not a DIY repair unless you have access to the right diagnostic tools and experience with variable valve timing systems.

Thanks for sharing your Passat experience, the symptoms really do match my situation. Since you went through this repair already, curious what the final cost was for fixing the VANOS solenoid and harness? Also wondering if youve had any other timing system issues pop up since the repair was done? My check engine light is still flashing and I want to get this sorted before it causes more engine damage. Just trying to budget properly and make sure I address everything at once.

I had the inlet VANOS solenoid and related components fixed about 6 months ago, total cost came to 250€ for parts and labor. The mechanic found a defective camshaft solenoid valve that was causing the timing issues. Since the repair, my engine has been running perfectly with no low power issues or engine misfires. These VANOS system problems can definitely cause the symptoms you are experiencing, and letting them go too long risks more expensive damage. Getting it fixed resolved all the issues, fuel consumption returned to normal and the check engine light hasnt come back on. The timing chain and other components were also inspected during the repair and everything else checked out fine. No additional timing system problems have occurred since then. The engine actually feels smoother and more responsive compared to when the VANOS solenoid was failing. Would definitely recommend getting it looked at soon while its just the solenoid, waiting too long can lead to catalytic converter damage from the engine running rich. The 250€ I spent was well worth preventing more extensive repairs down the line.

After reading the helpful feedback, I decided to get my Amarok fixed this week. Found a highly-rated VW specialist who actually had experience with VANOS failures on these engines. The diagnostic confirmed a failing inlet camshaft solenoid causing the variable timing issues and engine misfire. Total repair came to 280€ including parts and labor. They also checked the timing chain and other components while they were in there, everything else looked good with no signs of oil sludge or additional wear. Been driving it for a few days now and what a difference, engine runs smooth again, no more flashing check engine light, and fuel consumption is back to normal. Glad I got it sorted before any serious damage occurred. Really appreciate the advice that helped me understand the issue better before going to the shop.