I have a 1998 Buick Skylark with a 3.1 litre engine. At approximately 115K miles I took it to a local mechanic & had a complete tuneup IE: plugs, wires, hoses & serpentine belt. After having the tuneup I drove about 400 miles & the check engine light came on with Code P0420 I took it back to the mechanic & he said that the lower intake gasket was bad & he replaced it. Again I drove about 400 miles & the Light came on again with same P0420 Code. This time he replaced the oxygen sensors & then the light came back on again within about the same driving distance same code. This time the Catalytic Converter started making noise so I took it to a muffler shop & the Converter was completely burned out on the inside. I had them replace the converter & I then drove about 2000 miles & now the light is back on again. I then had a scan done (Autozone) and Code P0420 code came up. As you can see I have already spent several hundred dollars & the vehicle still has problems & of course will not pass inspection. Can someone possibly help me with what the problem might be. As soon as the light came on I have not driven it again because I don't want to damage the new converter. I had never experienced this problem prior to the tuneup. I guess my next step will be to have it checked by a garage that has more sofisticated test equipment. Any help & advice anyone could give me to get this problem resolved would be most graciously appreciated. Thanks Robert W. Joyner
- posted
18 years ago