Question about 1999 Volkswagen Passat
Scan tool returns the following codes 18010; 16684; 16686; 16685; and 16502. I changed all four ignition coils, spark plugs, and power transistor. What is the problem and how can I fix this myself. Thank you in advance for any assistance rendered.
Your codes are as follows:
18010: "ECT Circuit High Input"
16684: "Random Misifre"
16685: "Cyl 1 Misfire"
16686: "Cyl 2 Misfire"
18010: "Voltage Supply Terminal 30 Voltage Too Low"
Your codes 16684, 16685 and 16686 are symptoms, not the problems. Obviously your engine is running roughly. So, once you get the problem fixed, these codes should go away on their own.
The 18010 code is normally displayed after the vehicle's computer has been re-set or replaced. If you've recently attempted to reset the computer in an effort to fix your issues, don't worry about this code. It too will go away when you get the main problem fixed. If you haven't reset the computer (or disconnected the battery for any other reason), then you'll want to check your battery cables and the power source cables running to your computer to make sure they're connected securely and are free of corosion.
Having said all this, we get to the root of your problem (code 16502). This code is triggered when your Engine Coolant Temp Sensor goes bad. The sensor typically sells for $60.
To remove and replace it:
Hope this helps and good luck!
Posted on Jan 12, 2009
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