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Discussion Starter · #1 ·
93 Corolla wagon, 1.8L engine, California emissions
Is the same upstream oxygen sensor now used at the exhaust manifold and just before the catalytic converter?
I just see upstream sensors with no specific location
while a Toyota site lists #89465-19545 for the front & #89465-19555 for the rear - neither of which is currently available
Thinking of using NTK #24502 for both??
TIA!
 

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1997 Corolla
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One has a built in heater (bank 1, sensor 2) and the other (bank 1, sensor 1) doesn't, at least on the 1997, so they have different connectors.

A site like densoproducts.com shows the 2 different sensors. The universal sensors listed don't have the connectors, so you'd have to splice in the old connector.
 

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Porsche
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Hi and welcome to TN!

The NTK #24502 won't work as rear sensor because flange-spacing doesn't match. And ECU will throw code for failed heater circuit.

Here's upstream sensor: Denso 234-2052 Oxygen Sensor
Downstream one hardly ever fails and it doesn't contribute anything to AFR. Just used to double-check catalytic.
 

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Discussion Starter · #4 ·
Thanks for all the info!
I've confirmed that the upstream O2 sensor next to the manifold is indeed a 2 wire & flange is different from manifold one.
I've ordered the Denso universal type replacement for the 93.

Thanks again!
 
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