Oldsmobile Alero Oxygen Sensor - Select Year

Position: Front
Direct Fit - - After Catalyst - Before Catalyst - Before Catalyst
w/ Flex Fuel Engine (Engine Vin - 8th Digit - will be '5') -

Position: Front
Universal Fit - - 2WD - 2WD - California - 2WD - Exc. California - 4 Wire square female Plug - 4 Wire square female Plug 4 Wire square female Plug - 4WD - 4WD - California - After Catalyst - After Catalyst - California - After Catalyst - Firewall side - In Exhaust Pipe - After Catalyst
Right - At Front Exhaust Manifold Outlet - Radiator Side - At lower cat. outlet on non-Calif. model - At Rear Catalyst Outlet - At Rear Catalyst Outlet - Exc. California - Before Catalyst - Before Catalyst - California - Before Catalyst - Firewall Side - On Exhaust Pipe - Before Catalyst - Firewall Side - On Exhaust Pipe - Federal - Before Catalyst - Radiator Side - On Exhaust Pipe - Before Catalyst - Radiator Side - On Exhaust Pipe - Federal - California - California - 2WD - California - Wagon only - California Emissions - California Emissions - w/29.8" Pigtail - Catalyst Outlet - Converter - Exc. California Wagon - Exc. Canada Built - Exc. Canada Built w/ Regular or Flex Fuel Engine - Except Mexico of Canadian Built Vehicle
(After Catalyst) - Except Mexico or Canadian Built Vehicle
(After Catalyst) - Front - Radiator Side - Front - Radiator Side - Front - 2 Required Rear - 2 Required - Front Catalyst Outlet - California - 2WD - GVW under 8500 Lbs. - In Header Pipe - In Header Pipe - 4WD - In Header Pipe - California - In Header Pipe - California - 4WD - In Header Pipe - Exc. California - Located at Manifold - Non-California - OE Style - OE Style - 4-Wire - OE Style - 4R70 - OE Style - California & Massachusetts - OE Style - California & Massachusetts - Under 8500 lbs. GVW - OE Style - California & Massashusetts - OE Style - California FLEX - OE Style - Exc. Califonia - OE Style - Exc. California - FLEX E40D - OE Style - Flex - OE Style - Under 8500 Lbs. GVW - California & Massachusetts - OE Style 4-Wire - OE Style 4-Wire - Located at Exhaust Pipe - On Exhaust Manifold - Radiator Side - On Exhaust Pipe - Rear - Firewall Side - Rear - Firewall Side - w/ Canada Built - w/ Electronic Automatic Transmission - w/ Electronic Transmission -

Position: Front
Direct Fit - - (After Catalyst) - (Before Catalyst) - (Before Catalytst) - After Catalyst - After Catalyst
(Square Connector) - After Catalyst
Right - At Exhaust Manifold - At Exhaust Manifold
w/ Heated Sensor - Exc. Canada Built - Exc. Canada Built w/ Regular or Flex Fuel Engine - Except California Emission System
(Before Catalyst) - Except Mexico of Canadian Built Vehicle
(After Catalyst) - Except Mexico or Canadian Built Vehicle
(After Catalyst) - GVW under 8500 lbs. - Located at Manifold - Position 1 (In Exhaust Manifold/ Crossover) - w/ 4-Wire Sensors
(Before Catalyst) - w/ Canada Built -

Position: Front
- Before Catalyst - California - Canada Built - Front - 2 Required Rear - 1 Required - Front - 2 Required Rear - 2 Required - Late Production - Pre Converter (Position 2) - Stamped 12559850 - w/ Canada Built - w/ Canada Built w/ Regular or Flex Fuel Engine - w/ Mexicio or Canadian Built Vehicle
(After Catalyst) - w/ Mexico or Canadian Built Vehicle
(VIN "T")
(After Catalyst) - w/ Pre Converter (Position 2) -

Quality: OEM
Position: Front
- Before Catalyst - Before Catalyst
w/ Flex Fuel Engine (Engine Vin - 8th Digit - will be '5') -

Position: Front
- After Catalyst - Before Catalyst - Before Catalyst
w/ Flex Fuel Engine (Engine Vin - 8th Digit - will be '5') -

Quality: OEM
Position: Front
OE Type - - (After Catalyst) - (Before Catalyst) - (Before Catalytst) - After Catalyst - After Catalyst
(Square Connector) - After Catalyst
Right - At Exhaust Manifold - At Exhaust Manifold
w/ Heated Sensor - Before Catalyst - Exc. Canada Built - Exc. Canada Built w/ Regular or Flex Fuel Engine - Except California Emission System
(Before Catalyst) - Except Mexico of Canadian Built Vehicle
(After Catalyst) - Except Mexico or Canadian Built Vehicle
(After Catalyst) - GVW under 8500 lbs. - Located at Manifold - Position 1 (In Exhaust Manifold/ Crossover) - w/ 4-Wire Sensors
(Before Catalyst) - w/ Canada Built -

Quality: OEM
Position: Front
OE connector - - (After Catalyst) - (Before Catalyst) - (Before Catalytst) - After Catalyst - After Catalyst
(Square Connector) - After Catalyst
Right - At Exhaust Manifold - At Exhaust Manifold
w/ Heated Sensor - Exc. Canada Built - Exc. Canada Built w/ Regular or Flex Fuel Engine - Except California Emission System
(Before Catalyst) - Except Mexico of Canadian Built Vehicle
(After Catalyst) - Except Mexico or Canadian Built Vehicle
(After Catalyst) - GVW under 8500 lbs. - Located at Manifold - Position 1 (In Exhaust Manifold/ Crossover) - w/ 4-Wire Sensors
(Before Catalyst) - w/ Canada Built -

Direct Fit - - After Catalyst - After Catalyst Bosch Oxygen Sensor #13 111 - After Catalyst Bosch Oxygen Sensor #13 111 Check/Replace Interval (miles) 100,000 - After Catalyst Bosch Oxygen Sensor #15 544 -

Direct Fit - - After Catalyst - After Catalyst Bosch Oxygen Sensor #13 111 - After Catalyst Bosch Oxygen Sensor #13 111 Check/Replace Interval (miles) 100,000 - After Catalyst Bosch Oxygen Sensor #15 544 -

Direct Fit - - After Catalyst - After Catalyst Bosch Oxygen Sensor #13 111 - After Catalyst Bosch Oxygen Sensor #13 111 Check/Replace Interval (miles) 100,000 - After Catalyst Bosch Oxygen Sensor #15 544 -

Quality: OEM
Position: Front
- After Catalyst - Before Catalyst - California - Canada Built - Front - 2 Required Rear - 1 Required - Front - 2 Required Rear - 2 Required - Late Production - Pre Converter (Position 2) - Stamped 12559850 - w/ Canada Built - w/ Canada Built w/ Regular or Flex Fuel Engine - w/ Mexicio or Canadian Built Vehicle
(After Catalyst) - w/ Mexico or Canadian Built Vehicle
(VIN "T")
(After Catalyst) - w/ Pre Converter (Position 2) -

Quality: OEM
OE Connector - - After Catalyst - After Catalyst Bosch Oxygen Sensor #13 111 - After Catalyst Bosch Oxygen Sensor #13 111 Check/Replace Interval (miles) 100,000 -

Quality: OEM
OE Connector - - After Catalyst - After Catalyst Bosch Oxygen Sensor #13 111 - After Catalyst Bosch Oxygen Sensor #13 111 Check/Replace Interval (miles) 100,000 -

Quality: OEM
Position: Front
Universal - - After Catalyst - After Catalyst
Right - At Catalyst Inlet or Outlet - At Catalyst Outlet - At Exhaust Manifold Outlet - At Exhaust Manifold Outlet or Catalyst Outlet - At Left or Right Y-pipe Inlet & At Catalyst Outlet - California - Catalyst Inlet or Catalyst Outlet - Exc. Canada Built - Exc. Canada Built w/ Regular or Flex Fuel Engine - Except Mexico of Canadian Built Vehicle
(After Catalyst) - Except Mexico or Canadian Built Vehicle
(After Catalyst) - Front - 2 Required Rear - 2 Required - GVW under 8500 Lbs. - Located at Manifold - OE Style - 4-Wire - OE Style 4-Wire - OE Style 4-Wire - Located at Exhaust Pipe - w/ Canada Built - w/ Electronic Automatic Transmission - w/ Electronic Transmission -

Quality: OEM
Position: Front
-

OE Style - OE Style -

Position: Rear
OE Style - OE Style -

Quality: OEM
- Before Catalyst - Engine - L61 - OE Type - Before Catalyst - Position 1 -