Please provide input/suggestions!

[Travo60]

Recently I've had some issues with my 03' v6 4runner. My check engine light was on and was getting multiple codes in reference to the O2 sensors. Having diagnosed the codes I went ahead and changed the upstream and downstream O2 sensors on Bank2 (driver side) with Bosch O2 sensors. Since replacing the sensors on Bank2 I have cleared the codes in reference to the O2 sensor, however I can't go get a inspection due to the "Evap System Mon" and "Catalyst Mon" being "incomplete" after being driven 300 miles. Should I replace the other two O2 sensors on Bank1, or would that be a waste of time. Is there something else I can do to help these tests complete? Any input would be greatly appreciated!

Regards,
-Travo60

 

[oljedi11950]

You didn't replace all 4 ? Use denso

 

[Travo60]

No, I didn't replace all four sensors. Could that be a potential problem having two new and two old sensors? The codes I received prompted me that only bank2 was the problem side. Are Bosch not compatible with the 4runner?

 

[oljedi11950]

Yes but for some reason some of the guys seem to have probs with em , don't know why when changing plugs on the v6s 3 were denso & 3 ngk so who knows . The front 2 are air fuel & rear are actually o2 sensors & they all measure the gases that pass thru so possible that the ecu is getting mixed info so most of us change all 4 at once then you know for sure . Older models have had some issues with cats , or it could be gaskets on front manifolds , saw someone posted about spraying them with soap & water for leaks , a exhaust leak will pop a code so all kinda bs . I don't know how they do it n Tejas but here n Nv they just plug into the ecu plug & if no cel and good emissions we pass . I had popped a 0420 & also cleared mine and passed within 50 mi .

 

[Travo60]

Okay thanks for the feedback, I may end up changing all 4. I also pray that its not the cat as that would be $$. However like you said if it were an exhaust leak there would be codes, so I hope thats a good indication. I'm pretty sure that my local shop(s) won't pass my vehicle due to the incomplete indicators popping up. I'll also try the soapy water on my gasket areas and see if there is any leaks, not today, believe it or not the outside temp is only 39 in Texas this morning. Too cold for us southerners to be messing around outside.

 

[Travo60]

P0430, Failed Cat: Bank2. Total Cost: $870 at local shop. Hope nobody else has to go through this.