It will also be much louder, so take that in to consideration. It should definitely throw a check engine light. If there is an O2 sensor after the cat, it may cause problems. That often solves the problem, and is a lot cheaper than a new Cat. The Cat could be bad, but I'd try replacing the sensor first. The Cat can be fine, and you'll still get the 'Not Ready', just due to a worn out sensor. It actually helped fuel economy slightly. The before Cat sensor will affect your MPG, the after cat sensor monitors the Cat, and can give the 'Cat Not Ready' code. Fit For:Â 1998 - 2000 Lexus GS400 All Models - Pre-cat Left 1998 - 2000 Lexus GS400 All Models - Pre-cat Right 2001 - 2007 Lexus GS430 All Models - Pre-cat Left 2010 Lexus GX460 All Models - Post-cat Right 2003 - 2004 Lexus GX470 All Models - Pre-cat Left 2003 - 2004 Lexus GX470 All Models - Pre-cat Right 1995 - 2000 Lexus LS400 All Models - Pre-cat Left 1995 - 2000 Lexus LS400 All Models - Pre-cat Right 2001 - 2006 Lexus LS430 All Models - Pre-cat Left 1998 - 2004 Lexus LX470 All Models - Pre-cat Left 1998 - 2004 Lexus LX470 All Models - Pre-cat Right 2005 Lexus LX470 Models Up To - Pre-cat Left 2005 Lexus LX470 Models Up To - Pre-cat Right 2008 Lexus LX570 All Models - Post-cat Right 1996 - 2000 Lexus SC400 All Models - Pre-cat Left 1996 - 2000 Lexus SC400 All Models - Pre-cat Right 2002 - 2010 Lexus SC430 All Models - Pre-cat Left 2003 - 2004 Toyota 4 Runner 4.7L Engine - Pre-cat Left 2003 - 2004 Toyota 4 Runner 4.7L Engine - Pre-cat Right 2010 Toyota 4 Runner All Models - Post-cat Right 2010 Toyota FJ Cruiser All Models - Post-cat Right 2000 - 2004 Toyota Tundra 4.7L Engine - Pre-cat Left 2000 - 2004 Toyota Tundra 4. ZAchole 2 What year is it I removed the CAT on my '91 with no problems.
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