VW Fox Diesel Coolant Loss Linked to Check Engine Alert

Had a similar situation with my 2010 VW Polo 1.6 TDI. The recurring coolant loss combined with check engine warnings pointed to a major issue that required proper diagnosis, not just topping up the coolant reservoir. The real problem turned out to be air pockets forming in the cooling system due to a damaged radiator cap that wasnt maintaining proper pressure. This allowed coolant to escape through a barely visible crack in one of the radiator hoses. The cooling fan was also cycling more frequently than normal, which should have been another warning sign. The coolant loss in your Fox needs thorough investigation, particularly around: Pressure testing the entire cooling system, Inspecting all radiator fluid connections and hoses, Checking the radiator cap seal, Testing the water pump for leakage This isnt a problem to ignore, as continuous coolant loss can lead to engine overheating and potentially severe engine damage. The diagnostic codes should help narrow down the specific area of concern.

The same happened to my Fox last year. Had to deal with coolant loss and those annoying warning lights too. After getting it properly checked, turned out the head gasket was starting to fail, letting coolant seep into places it shouldnt. Fixed it properly and havent had any issues since. Just wondering, do you remember roughly what the repair cost in your case? Also, has everything been running smoothly since the fix, or did you notice any other problems? Those cooling system issues can sometimes reveal other underlying problems that might need attention.

After my mechanic ran a complete diagnostic, they found the actual problem was just a faulty connection to the coolant level sensor. The repair was relatively straightforward, just needed to fix a loose cable and plug connection that was causing false readings and triggering the check engine light. Total cost came to 95€, which was a relief since I was worried it might be something more serious like a head gasket issue. Since fixing that sensor connection, the coolant level has remained stable in the reservoir and the warning lights have completely stopped. The cooling fan is running normally now, and I havent needed to add any coolant in the past 6 months. Much better outcome than expected, especially compared to your head gasket situation. A proper diagnosis really made the difference, instead of just topping up coolant like the first shop did, finding the actual sensor issue saved me from potential future problems and unnecessary repairs.

After dealing with that frustrating check engine light and coolant issue, I finally got it sorted properly. Took it to a different mechanic who actually spent time diagnosing rather than just refilling the coolant reservoir. Turned out my water pump was failing and had developed a slow leak, plus they found a damaged radiator cap that wasnt holding pressure correctly. The whole repair came to 280€, including a new water pump, radiator cap, and fresh coolant flush. The engine overheating warnings have completely stopped, and I havent had to add any coolant for the past 3 months. My previous mechanic could have saved me time and money by checking these components first instead of just topping up fluids. At least now I know what signs to watch for if similar issues come up again. Good to hear about your sensor fix, definitely got lucky there with the lower repair cost. These cooling system problems can really vary in severity and cost.