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UNDER VEHICLE, DRIVER SIDE, BELOW SEATING AREA, MOUNTED IN EXHAUST PIPE IN REAR OF CATALYTIC CONVERTER.
I have a 2001 Suburban 2500 with 8.1 engine, with four original oxygen sensors. Two are located ahead of the catalytic converters in the exhaust headers and two in the tail pipes after the catalytic converters. One went bad (got several check engine - heater error codes), so I replaced all four, because the GM manual and Bosch say the oxygen sensors are good for 100,000 miles (I have 108,000). Decided to go with NTK brand (owned by NGK spark plug company), because some people claim they are more durable than Bosch. Bosch invented oxygen sensors and has made more than any other company. NTK now produces more per year than Bosch (or any other company). Used three NTK P/N 21313 ($59.89 each) and one NTK P/N 21518 (left rear @ $82.89). You will need a 22 mm open end wrench to remove & install. Old sensors were hard to break loose (used hammer and a big box-end wrench as "cheaters"). New sensors went in and fit great to OEM electrical plugs - followed good NTK instructions. Plugs have a funky blue plastic lock pin - pull that first, then lift clip and pull plug apart. Used two zip-ties per sensor to keep wires away from hot / moving parts. Should get better gas mileage now - haven't yet checked. One word of advice - avoid cheaper "universal" oxygen sensors because you have to use the old electrical plugs and splice 4 wires per sensor - all in bad locations.
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∙ 13y ago
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