O2 sensor replacement
New member. '01 Pathy, XE 4WD 5sp. Scanner showed Bank 1 lean, so replaced the B1 Sensor 2 (downstream) O2 sensor today. Never done it before, but pretty straight forward. The sensors before the CAT appear to be different story. Anyone who has done B1 & B2 upstream, is it as tricky as it looks? Hoses come off; manifold cover off and on Drivers side, air intake... does all this have to come off to get at the upstream sensors? Thinking I might be do plugs and maybe coils if so as I am due with plugs (Plat) nearing 100K and five original Coils (180K miles) ... Would appreciate feedback on the o2's and open to comments on plugs n coils. Severe stumble and hesitation on startup till warm.