The 98 gen2.5 threw a code today. P1035

Is it usually the O2 sensor itself or is there some relay somewhere?

Before I replace the O2 sensor I thought I'd run it by you guys.

Thanks in advance.



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96 Montero LS 24V DOHC 3.0L.
98 Montero 24v SOHC 3.5L, factory rear locker, Winter/tow package.
63 Jaguar XKE 3.8L FHC
2000 Mercedes-Benz e430
07 fj cruiser