HI guys, i drive a mk4 1.6s Golf. I had the error codes P0135 and P0130 come up when i plugged my pocket computer into my car which read back as 02 sensor heater circuit malfunction and 02 sensor heater circuit (high voltage).

I have replaced both sensors and its still reading the same error codes but its a little intermitent.

When the original sensor was on i could turn the code off and it would last a couple of weeks before coming back on but now with the new sensors on it comes back on as soon as it gets turned off.

So i put the old one back on and again it takes around 2 weeks to come back on.

Please help :D