I bought this because the check engine light came on and I got code 420. I replaced the defective unit with this one and the codes didn't come back. I also replaced the O2 sensor although it was not defective. The 2003 Honda Accord had the original catalytic converter and the screws were in poor condition. The front three were fairly easy to loosen with bolt extractors. No nuts were visible on the rear bolts as they had deteriorated so I cut them off with a grinder. The new block came with a front plate gasket and a rear o-ring seal. Along with him I used a padding material that I had to buy. It also came with six mounting nuts and bolts. I am very happy with the purchase. The new device also passed the smog test.
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