Hi there, did you manage to find the sensors on your golf? I just finished my cell and I'm about to install it. I know the O2 sensor is in the exhaust manifold if you look under the hood behind your engine you'll see a thick pencil like metal piece sticking out your exhaust manifold with 2 wires. I'm still trying to locate the map sensor or maf sensor myself. Let me know what you come up with.
MAF sensor is located between air filter & air intake on engine, its in a plastic housing in the middle of the rubber hoses. BE CAREFUL THIS IS A DELICATE & EXPENSIVE COMPONENT.
MAP sensor is located on hose outlet from intercooler on the offside of the engine near the wing. AGAIN,, BE CAREFUL, DELICATE COMPONENT
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Yes, it could be something else, other than the converter, such as a faulty o2 sensor. Take your VW to Autozone or Advance auto, and ask them to a do a scan, to see what they come up with ( think it's free).
Honestly it is not very expensive to replace, but it is not extremely important. What it does is measure the oxygen/fuel level coming out of the engine. This tells the computer that the engine is either using the right air/fuel mixture or allows the computer to change the mixture slightly to allow the car to run properly. You could pull the sensor out and clean the terminal as it usually has alot of carbon build up due to its location, but this is normally a temporary fix. I hope this helps you with your problem.
I have yet to see a car with a Nitrogen Oxides(NOx) sensor on it. However I have seen Oxygen (O2) sensors. The O2 sensor monitors the remaining amount of oxygen left in your exhaust, and tells your Engine Control Unit(ECU) how much fuel to use. The sensor looks much like a stainless steel spark plug and is found in the exhaust system. Your car being a 1991 it should only have one. It will be up stream of the Catlytic converter, maybe in the Exhaust manifold. cost between 50 and 150$us.
do you mean the mil or engine check lamp??? it will have a picture of an engine.. if it is this lamp then it has an engine management fault and will need to be checked on an OBDII scaner.. your vw dealer will be able to help, or most auto-electricians will have this tool...