* OBD II Says O2 Sensor...Which one is it?!? *

[wynndi]

I have an Auto X-ray scanner that gets some use on my '96 SVX.

Seems that the only code tripping my C/E light is "P0145 Sensor Circuit Slow Response ( Bank 1 Sensor 3 )"

It is usually tripped at 70+ MPH, normal operating temp, normal RPM.

This only lights up occasionally, and can be successfully reset without recurring for a few hundred miles.

My question is : Which O2 sensor is it?

[Beav]

No such thing as a B1S3, at least not that I've ever seen and I do this shtuff daily. There are two 'upstream' sensors - B1S1 & B2S1 - and two 'downstream' sensors - B1S2 & B2S2.
Upstream regards the sensors before the catalytic convertors and downstream, drum roll please, refers to the sensors after the cats.

BTW, Bank 1, no matter who made the car, refers to the side of the engine that has cylinder #1 (the farthest forward cylinder), on inline engines there is only bank 1.

[wynndi]

That narrows it down some!

If I replace the O2 sensor by #1, I'll have a 50/50 shot of getting it right!

Anyone else with OBDII and this code?

[Beav]

Actually you could try disconnecting the sensors, one by one, and turning the ignition on. This should set a code and identify the culprit.