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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Was trying to diagnose a perceived lack of passing power on the highway. Considered the potential for a clogged cat.
Ran a scope in through the upstream O2 hole. Seems mostly clear, but it does appear cracked in one spot. Is this normal or should I probably consider changing it?
Do a pressure test. Just drill a small hole in the exhaust before the cat, stick your gauge in there, and see what pressure is at idle. If it's over 2PSI, replace the cat.
Not sure... mine "fell off" and was replaced by a little cheater chip that varies the voltage just enough for the downstream O2 sensor not to though an engine code.