If it's the o2 issue caused by the cat, just unplug your battery, stand on the brake pedal for 30 seconds, then replug it in. Some have gone a month without the light returning, some have only gone a week. Mine takes about 2 weeks. I have the o2 cheater, does not work on my car, still get the light. It's not too big of a deal to reset the light once a week or so. Just my 2 cents. Later doods