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Message: <blockquote data-quote="reivaxtorres" data-source="post: 352099" data-attributes="member: 8890">yes and no. in this case, its not telling you that they arent there or that the cats arent working, its telling you there is a problem with the signal they are sending. check out this site: <a href="http://home.comcast.net/~miracerros/dtc_powertrain_1.htm" target="_blank">http://home.comcast.net/~miracerros/dtc_powertrain_1.htm</a>P0136 & P0156 : CODE:            What they mean:       Possible cause:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />0136 - HO2S Sensor  : The downstream HO2S  : * Pinched, shorted,  :: Circuit Malfunction   : sensor(s) are        :  and corroded wiring :: (HO2S-12)        : continuously checked   :  and pins.        ::                : for maximum and      : * Crossed sensor    ::                : minimum voltages. The  :  wires.          ::                : test fails when the     : * Exhaust leaks.    ::                : voltages fail to meet    : * Contaminated or   ::                : the calibrated limits.    :  damaged sensor.   :: P0156 - HO2S Sensor : See DTC P0136       :: Circuit Malfunction   :: (HO2S-22)        :</blockquote>