Join Date: Mar 2017
Vehicle: '01 SLK320 Lazulithe Blue, '00 SLK230 Bahama Blue (needs interior parts)
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Can believe a second cat is a resonator. A cat relies on a high exhaust temperature (believe is above 600 F ) to work & the first one will cool the gas significantly. For that matter the second set of O2 sensors are not supposed to read anything when everything is operating properly, just sit at midpoint. Could probably replace with a pair of resistors.
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