1994 LS400 Catalytic converter REPLACEMENT.......O2 sensor question
#17
Pole Position
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Eastern brand
#18
Pole Position
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Update:
replaced all parts, cats and sensors, fuel filter......STILL HEARING A MISS!! Mechanic looking at the possibility of a bad plug or wire. Wants to diagnose problem before putting new cap and rotor, plugs and wires on. ANY IDEAS!??
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#20
Lexus Test Driver
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here are my notes for my '91:
O2 sensors
Denso is OE, Walker is a decent alternative.
There are 4 total
2 "main" O2 sensors are Left and Right, pre-cat, identical, heated, 4-wire (blue, white, 2 blacks for the heater - polarity of those does not matter).
Denso OE is 234-4211
Denso universal is 234-4000
Walker universal is 250-24000
2 secondary O2 sensors are Left and Right, post-cat, identical, not heated, 2-wire. Only for emissions testing. Do not affect running. Only reason to change those is if I get a CEL telling me they're bad.
Denso OE is 234-2015
Denso universal is 234-2000
Walker universal is 250-22000
O2 sensors
Denso is OE, Walker is a decent alternative.
There are 4 total
2 "main" O2 sensors are Left and Right, pre-cat, identical, heated, 4-wire (blue, white, 2 blacks for the heater - polarity of those does not matter).
Denso OE is 234-4211
Denso universal is 234-4000
Walker universal is 250-24000
2 secondary O2 sensors are Left and Right, post-cat, identical, not heated, 2-wire. Only for emissions testing. Do not affect running. Only reason to change those is if I get a CEL telling me they're bad.
Denso OE is 234-2015
Denso universal is 234-2000
Walker universal is 250-22000
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CELSI0R (09-17-18)
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jpaulmac
LS - 3rd Gen (2001-2006)
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06-01-10 08:43 AM