Not sure what, or how, but I guess it's possible.I replaced my converter last weekend, and so far about 450 miles later and still no CEL. However, supposedly (at least according to catalytic converter manufacturers) if the converter is having restricted air flow, then prolonged use could cause some damage to the engine. If it is the second O2 sensor, then it would just cause a CEL, but the converter would be converting, and no particular impact other than driving around with a constant CEL will keep you from noticing if something else goes wrong that sets a different CEL code.If it is the converter, it could be not converting well, in which case you'd be putting out more pollution, but have no other particular impact (other than the constant CEL). Quote, originally posted by cgello » Is this something that will hurt the car in the long run or is this simply an emissions problem? I can think of a couple of scenarios. Edit 12/6 Been 1000 miles or so since I replaced the O2 sensor, and no return of the CEL. pused the box end wrench down the wire and over the grommet. Probably a metric size that's an exact fit, but a 7/8" wrench was a near perfect fit. Have to pull up the frontright side of the carpet on the front passsenger side, disconnect the wire, push the grommet through the floor, and then unscrew the sensor from the exhaust pipe. Disconnected the battery to reset the light. Today I put in a new O2 sensor, the one after the cat, and hopefully the CEL will stay away. Disconnected the babttery for a while, reconnected it, and the ight was gone, but came back after about 400 miles. So, now I need to decide whether to buy the O2 sensor anyway in case the CEL comes back, cancel the order and deal with it if it ever does come back or perhaps figure out your secret source of $35 O2 sensors and stock up.wel, the CEL went away on it's own, and I thought I was golden, but then it came back. Quote, originally posted by joatmon Â✽idn't check GM, but Toyota wants $150 Autozone wants $70, so I ordered one, and then today on the way in to work I noticed the CEL was off.
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