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There are 4 O2 sensors on my 1997 F-150. There are 2 just after the exhaust manifolds (one on either side of the engine). These two are visible in the engine bay but are easier to remove through the wheelwell after removing the splashguard. The other two are just after the catalytic converters, again one on either side. i'm assuming your check engine light is on and you had a diagnostics done. the bank 1 sensors are on the passenger side of the vehicle and bank 2 is drivers side, at least in my truck. in fords in general bank 1 is on the side of cylinder 1 in the firing order. sensor 1(upstream) is the ones in the engine bay and sensor 2 (downstream) is after the cats... hope this helps, i jus got done doing mine and i found that if sensor 1 goes that #2 tries to pick up the slack and it too will fail soon. its best to replace them in pairs on the same bank side
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∙ 9y ago
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