fmshaw1971

I've owned the car 7+ years and I got my first CEL today. It's a 67 which is pretty harmless, but still, it bugs me.

I have had a Random Cat installed on the car for over a year with no CEL. A few weeks ago I replaced both my 02 sensors with the Walker universal unit.

If one of the wires had come loose on the secondary sensor, wouldn't I get a code 63 or 65? A code 67 only means that the cat is not functioning properly, right?

My only guess is that the old O2 sensor (which had 114k miles on it) didn't see a problem with the cat whereas the new o2 sensor works a little better and thinks the Random Cat is malfunctioning.

Either way I will reset the ECU and run some Seafoam through the engine to see if I can clean it out.

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97 EGP Base 5spd Prelude. Engine: DC short ram, DC SS headers, AEM pulleys, Random High flow cat, Mugen sport exhaust, Apexi VAFC. Suspension: Tein SS, Tanabe front lower tie, Neuspeed front upper strut, Neuspeed rear sway, Tanabe rear upper strut, DC rear lower tie, 17X7.5 5Zigen Typhoons with 215/40/17 Goodyear F1 GS-D3s. Other: Bride Ergo II, Spoon oil cap, Magnecor wires, relocated Odyssey 680 battery, Denso iridiums, Mugen pedals, Mugen lugnuts, shortened shifter w/ Momo airleather, Rotora slotted rotors and Endless NA-Y pads, Goodridge SS lines.