176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO2S - fuel control
177 (M) Oxygen sensor not switching - system was rich Left or Front HO2S - Fuel control
332 (R,M) EGR did not open/respond during test or if memory code, did not open intermittantly (EGR CLEANING!)
542 (O,M) Fuel pump open, bad ground or always on - - Power / Fuel Pump Circuits
543 (O) Fuel pump monitor circuit shows no power - Power / Fuel Pump Circuits
(M) (Service 556 code first if present) Fuel pump relay or battery power feed was open - Power / Fuel Pump Circuits (check your fuel pump fuses and relays) Both 542 and 543 are related
172 (R,M) Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S - Fuel control
332 (R,M) EGR did not open/respond during test or if memory code, did not open intermittantly - EVR or PFE (yet again your EGR needs to be cleaned)
