Where is 02 sensor "Bank 1, Sensor 1" on '99LC?

[Chumblewot]

I got the dreaded PO135 code on my '99 LC. "02 Sensor Heater Circuit Malfunction--Bank 1, Sensor 1." Does anyone know where this sensor is located? Is it the one with the triangular-shaped flange? Any experience with aftermarket 02 sensors? My dealer says not to, but they would...;p
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[NMuzj100]

Left side manifold. Several here have used Denso sensors with no bad reports. I would stay away from the stuff sold by the average auto parts store.

Check with CDan for OEM parts at a great price.

 

[Rugster]

I got one from these people...

http://www.automedicsupply.com/index.php?&engine=V8-4.7L&stopredirect=yes&width=800&height=600

 

[cruiserheadrat]

Denso's have worked great for me. PO had removed cats and #2 sensors both sides.

 

[Chumblewot]

Thanks. Big savings over dealer part.