What have you done to your Tacoma today? 1st Gen Edition

Also I know you mentioned in the BS thread you threw a P0420 code so heres the FSM diagnostics for that as well

 

Yea that's what the link says I posted too.

 

I suppose so. Not sure how that'd help though. I have no idea what I would be looking for.

Interesting. one is at a constant 1v. The other is pretty steady above .55. Wonder if I'm running too rich, which would explain my shit mileage.

 

Could be. Is that the post or pre cat one?

 

My UG lists one as bank 1 o2 sensor and is fluctuating, and the other as bank 1 o2 wide, which is a steady 1v. I'm not sure which is which. But I think the fluctuating one should be pre-cat.

 

The PDF I posted is for bank 1 sensor 2, so I would assume thats post cat?

 

My phone won't open the pdf for some reason. Android problem I guess.

 

Hmm well..that doesn't help haha

 

Not sure if I missed it, but have you thrown any codes besides the P0420 that one time driving to Seward?

 

A few months back, but it was a shift solenoid code. Shouldn't be related.

 

I think I might have found something..?

for bank 1 sensor 1 the sensor may be faulty if:

After engine is warmed up, A/F sensor output* does not change when conditions (a), (b), (c) and (d) continue for at least 1.5 min.:
*: Output value changes at inside of ECM only

(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 – 140 km/h (25 – 87 mph) (c) Throttle valve is not fully closed
(d) After starting engine y 140 sec.

 

Well assuming the one that says bank 1 o2 sensor is indeed the first one, it may be in working order because it does fluctuate.

 

Whenever the output voltage of the A/F sensor remains at a certain value of approx. 3.8 V (0.76 V)*

or more, or 2.8 V (0.56 V)* or less (see dwg. 2) under any conditions as well as the above conditions,

the A/F sensor may have a short–circuit.

*: When using the OBD II scan tool (excluding hand–held tester).

 

From what I can tell, they both should be fluctuating.

 

Interesting. So if I'm understanding that right, it may be the post cat o2 sensor that is bad. because it's a steady 1v +/- .005v.

That's assuming the "bank 1 o2 wide" is indeed the secondary sensor.

 

If its that steady yeah I'd definitely say that is probably the issue. it's just a matter of figuring out which is which I guess

 

Are they identical? if so I would just buy one and test it in both to see if it changes.

 

No, the upper one is technically called an air/fuel sensor and the lower is an o2 sensor. So I don't think they're interchangeable

 

If the post cat one is bad then the cat could also be bad.