P0031 code

Found it's b1s1 a/f sensor and found the location for b1s1 and b1s2 sensors. What about b2s1& b2s2 locations? Does this truck have a/f and 02 sensors on bank 1? Can't seem to locate them. Can someone help? I read somewhere that b2s1 was located driver side near the exhaust manifold?? I'm trying to replace all the a/f and 02 sensors.

 

Oops, I meant does it have those 2 sensors on bank2 and if so, WHERE are they?

 

The best I can remember, it only has 1 A/F and 1 O2.
A/F is before the cat. O2 is after.

 

Thanks, I'll get those "2" sensors ordered from Rock Auto and get them swapped out ASAP.

 

Make sure to order Denso only

 

Yes, I had someone replace the upstream about 10 years ago,

$146 Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles

Denso 234-9001, I'll order that one and the downstream

$61 234-4189 Oxygen Sensor

234-4189. Thanks for the advice.

 

If that code is the only one you are getting, you don't need the downstream 02 sensor, only the upstream A/F sensor.

 

Yeah, I know, but this truck is 18 years old, I am just replacing both as a precautionary measure. You got any advise on front rotor upgrades? I've only ever replaced the pads/rotors once (2011) and due again, thought I might upgrade to something better? Or do you think better to just replace oem?

 

its just a big hunk of metal but for the pads ii ise akebono