what makes a catalytic converters go bad in a nissan titan?
several things..age..bad gas...insufficient warn up time..over rich system/air fuel oxygen sensors.......
Is there anything else I should have them check to prevent another one from going bad?
Misfiring, internal engine coolant leaks, and burning oil are the 3 most detrimental things to a catalytic converter. Get any engine issues fixed first before you replace the catalytic converter. Otherwise it will just fail again! If you have over 100,000 miles on your Nissan you're due for a tune up. Make sure they check the emissions decal on the vehicle. If it says California Emissions or C.A.R.B. Compliant you need a different (California Emissions) catalytic converter than if you have Federal Emissions. HTH. -Jim
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