Toyota Repair: 98 Camry V6 MIL light w/P0125, P1133, P1135, air fuel ratio, camry v6

Question
Hi Ted,

My wife's Camry ('98 "Japanese" V6 with California emissions and 50k miles) has a "check engine" problem.  I pulled the codes (P0125,P1133,P1135) and they seem to point to the air/fuel ratio sensors.  Since these cost so much, I'm hoping there is another (cheaper!) cause, say the sensor heater circuits (relay or fuse?), for example.  If not, is there a way to determine which of the 3 sensors is bad?  Car is running ok in open loop, but I need to get this fixed for her peace-of-mind.  Also, don't want to fry the cat!  A dealer visit would break the bank, so would prefer to self-install Denso OE replacement sensor(s) myself.  Have heard that sometimes the manifold gets damaged while removing the sensor?  That would really boost the repair cost!  Any hints besides liquid wrench?

Thanks for any help.

Earl  

Answer
The fist code(PO125) can be ignored, it is a direct result of the other two.
Both left and right bank O2(A/F ratio) sensors need to be replaced, in rare cases the threads of the manifold can become damaged when removing the sensors but this is not common, use rust penetrant and let it soak for a while, there is no code for the rear O2 sensor so it should be ok.
By the way, I could not find a PO1135, did you mean 1153?