Apex_1.8T
September 12th, 2006, 08:20 PM
Just got my 3rd CEL in 2 months. All three are P0420. The first two happened right after I had fill up with gas (Shell V-Power), so I figured I didn't tighten the gas cap enough. I disconnected the battery for a few minutes and the CEL light stayed off. This morning the CEL came on and I had about a half a tank of gas and been running on it since Saturday and for 200 miles.
The Code today is P0420 Catalyst Efficiency Below Threshold (Bank 1). So my question is, could my O2 sensor be slowly fading? I'm assuming it's the post O2 Sensor based on searching other forums. Or is it my CAT? Since it seems to stay off a few weeks after I clear it, I'll probably wait to fix it. Also I'm flat broke at the moment.
My car is a 2003 Jetta GLS 1.8T. All advice is greatly appreciated.
The Code today is P0420 Catalyst Efficiency Below Threshold (Bank 1). So my question is, could my O2 sensor be slowly fading? I'm assuming it's the post O2 Sensor based on searching other forums. Or is it my CAT? Since it seems to stay off a few weeks after I clear it, I'll probably wait to fix it. Also I'm flat broke at the moment.
My car is a 2003 Jetta GLS 1.8T. All advice is greatly appreciated.