Catalytic Converter needs replacing after a year on 1999 Infiniti QX4

My 1999 Infinity went off into a ditch in 4 feet of water. Had insurance company repair it, after the mechanic had it for three weeks - got it back and check engine light was on. Now brought it to another mechanic they say its the catalytic converter-un related to claim. I just had a new catalytic conv put in over a year ago. Can the damage to catalytic converter be related to being submerged in 4 ft of water?

by in Venice, FL on October 11, 2010
2 answers 2 comments
ANSWER by on October 11, 2010
The catalitic converter could be damaged if it was full of water. If the car set for a while, I'd expect the exhaust to have water in it.
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COMMENT by on October 12, 2010
Thank you Superbob, We picked up our car from dealer and we are going to get a local mechanic to look at our car. It seems to me that after sinking into a ditch of water, the exhaust was under water as well and we saw the water draing out.
ANSWER by on October 12, 2010
First off... you need to make sure that the catalytic converter that was installed was made by Infiniti. We have found that non-OE catalytic converter will ofter fail and set the check engine light. Secondly, check the oxygen sensor connectors and look for corrosion on the connectors, that may be causing the wrong signals to get back to the computer. Good Luck! - A+ Japanese Auto Repair, San Carlos CA 94070
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COMMENT by on October 12, 2010
Thank you Eric, we will ask the mechanic who installed it and make sure. It was expensive enough, I hope it was an infinity part.