GM 30020669
Catalytic Converter

Start by lifting the vehicle before proceeding with pup Catalytic Converter replacement. It is necessary to disconnect the ho2s1 heated Oxygen Sensor's electrical connector. First remove the twc bolts from the pup Catalytic Converter before you disassemble it from the standard Catalytic Converter assembly. First remove the three nuts from the pup Catalytic Converter's flange so you can separate it from the Exhaust Manifold before removing the pup Catalytic Converter from your vehicle for cleaning its gasket and seal mating surfaces. Install new gaskets and seals for the new pup Catalytic Converter before installation. Fasten the pup Catalytic Converter to the Exhaust Manifold using three nuts at this point but maintain loose fasteners. Secure the pup Catalytic Converter to the standard Catalytic Converter assembly with twc bolts but do not fully tighten them at this time. Reconnect the wire harness at the heated Oxygen Sensor (HO2S1). System components should first be aligned correctly then fasteners need to be tightened to avoid noise and vibrations during this process. Secure the pup Catalytic Converter to the standard Catalytic Converter assembly bolts using 50 nm torque (37 ft. Lbs.) while also secure the pup Catalytic Converter Exhaust Manifold nuts to 50 nm torque (37 ft. Lbs.). Finally, lower the vehicle.

35 Nm (26 ft. lbs.).

The electrical connector to the Heated Oxygen Sensor (HO2S1).

With a new gasket to the resonator/muffler/tail pipe assembly and secured with TWC nuts, but not fully tightened yet.

The electrical connector to the heated oxygen sensor (H02S2).