Ok this no different then when I put the cat back system on my Mustang. It set the light because of having more exhaust flow. It ended up replacing both rear O2 sensors and the light hasn't come back on. So I suspect the same it with you car. You have removed the pre cat that was part of the exhaust manifold, so now the rear O2 sensor is seeing more exhaust flow (lower exhaust temp). You can try the spacer but don't rule out possibly having to replace it ok. As for driving it with the engine light on, no it won't harm it you just won't get the best mpg. If the light comes back on after the spacer please get me the actual code number so I can look into to tell you what may be needed.
Wednesday, January 13th, 2010 AT 10:04 AM