OBD scan tool will not scan 98 jetta 2.0 (bora uk)
I have a 98 vw jetta 2liter gas. The check engine light was on and just went out. Now the check engine light will not come on even when the ignition is turned on, also when the scan tool is hooked up it just reads Err. Car is also running really rough with a surging idle. It has new plugs, wires, fuel filter, and MAF. I have also unplugged the computer overnight and plugged back in and the Check engine light still will not illuminate. Im guessing the rough idle and slight misses might be from the EGR valve. Also when ignition is turned on there is a humming sound that seems to be coming from just behind the firewall on the interior side of the firewall that will stop if you disconnect the wiring to the throttle body. I guess its the thottle body it has the throttle connnected to the side of it. The rotor bug and distributor also probably need to be replaced since the prolonged use without changing it has given way to some craters on the post inside the cap. What to do about all these problems.
Thanks,
Will