Broken Bolts
CEG'er
Hello everyone. I have owned my 98 contour SVT for 7 months now and I absolutely love it! But every 400 miles I would get the check engine light to come on and when I scan it myself, it was p0430 catalyst efficiency below threshold bank 2. I would clear it and in exactly 400 miles, sometimes 350 miles, it would illuminate again and it was p0430. So I replaced the downstream (after the cat) oxygen sensor on bank 2, and I replaced the spark plugs (NGK iridiums), spark plug wires (bosch), and the fuel filter. Now 700 miles later the check engine light illuminates. I scan it and now it is p0420 cat efficiency bank 1. I'm thinking of replacing the downstream oxygen sensor on bank 1. Any ideas? I also would like to replace the upstream oxygen sensors as the engine has 130K miles on it at this point, but the upstream on bank 1 is impossible to get to. I can disconnect the wiring harness if I take the ignition coil pack off the engine but I still can't get a 22mm wrench or an oxygen sensor socket on the upstream oxygen sensor on bank 1. Has anyone replaced that sensor with the engine in place?