![]() This will pull the sensor out of the flow of exhaust gases and so it won't wet its pants from the exhaust gases without the cat. Drill out the back of one of the anti-foulers to 1/2 inch, so that you can screw the other non-modified anti-foulers into one end and then screw the O2 sensor into the other end. Remove the O2 sensor, get 2 spark pug anti-foulers from the nearest parts store ($4 tops). You can leave the pre-cat as-is and this should get rid of your CEL.or you can guy it for S's and G's but it might sound like rice. My suggestions is to use the sparkplug anti-fouler trick, I've done it in the past on previous cars and for $4 and an hours worth of work it's totally worth it (I'm most likely the other retard who spent an entire hour on this). Guess I'll just go with an OEM (or high flow, if it's cheaper) cat. Sounds like any modifications would be rather complicated. Then again, many Protege owners report the front cat going bad around 90k miles as a normal thing, so maybe us getting 130k out of it was good? I speculate that that could have helped the cat along. The O2 sensor codes have been lit for the past 20-30k miles, but we just haven't had the extra cash to get them fixed. If you have a CEL code for it, you have to fix that before doing anything else. There may be a header change to do it, an aftermarket header, or perhaps gutting the front cat.Ĭonsider that what often kills the front cat is a misfire. ![]() There may be no simple "straight pipe" for the front cat. If you delete the front O2 sensor, you can possibly get rid of the CEL by relocating the rear O2 sensor to behind the main (rear, bigger) cat. The rear O2 sensor only monitors the cat. The front O2 sensor is used by the ECU to determine fueling.
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