Will a Honda accord secondary O2 sensor work for a 2003 Acura RSX Type S?
I have been having some Idling problems with my car recently and think I may have damaged my o2 sensor, but I cannot afford the $200 for an RSX OE one and have been looking at several honda ones, and one for a 2002 accord down-flow or after cat appears to look like the same connection with a much longer cable, and its less than half the price and available locally. Does anyone know if this would fit or cause any problems with my 2003 Acura RSX Type-S? Any advice is greatly appreciated! Thanks in advance!!
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Legally you must use the manufacturer's specified OEM replacement part. You cannot substitute emissions control parts unless they are certified by the manufacturer as a suitable replacement.
Accord engines are quite a bit different from Acura engines even though they are both made by Honda. The Acura engines are all higher compression engines with different VTEC profiles and require premium fuel. Even if the Accord sensor physically fits it may not have the same electrical properties as the factory specified unit.
Actually, the rear or "downstream' (after the cat) O2 sensor won't affect your engine operation. It is just a monitor for the treated exhaust. Unless you have OBDII codes that specifically point at it there is no reason to replace it.