My Tundra tossed a P0031 code yesterday; this appears to be upstream drivers side. Should I be doing both upstream sensors? [It's a V8 and it has 4 O2 sensors, two on each side, with each side having a separate catalyst.] I'm guessing downstream can be left alone until they toss a code.
I was able to break loose both upstreams but the passenger side looks to be "fun" in that it's in an awful spot. I tried to break loose one downstream but I think it's going to fight me.
Not sure why Toyotapartsdeal doesn't call them upstream/downstream, guessing "air fuel ratio" means upstream while "oxygen" is downstream. That seems to match Rock's Denso's cross, nice of Denso to list the Toyota p/n. Little confused why they wouldn't use the same p/n for left and right side though, must be a wiring harness length thing.
I was able to break loose both upstreams but the passenger side looks to be "fun" in that it's in an awful spot. I tried to break loose one downstream but I think it's going to fight me.
Not sure why Toyotapartsdeal doesn't call them upstream/downstream, guessing "air fuel ratio" means upstream while "oxygen" is downstream. That seems to match Rock's Denso's cross, nice of Denso to list the Toyota p/n. Little confused why they wouldn't use the same p/n for left and right side though, must be a wiring harness length thing.