harleyman711

Hi , some around my place told me there is no difference between the A/F ratio temp sensor and the o2 oxygen sensor they told it just because Toyota naem it like that to difference the position of the parts .


his that right .




thanks

TheDurk

They do the same thing but the technology is different. They are in the same position but you can't substitute one for the other and the cats and ECU the A/F's work with are different on 4Runners. A/F's on 3G 4Runners are on '99 & '00 Cali. emissions trucks and all '01+ models.

harleyman711

so if I understand my truck is a cali model vzn185 I am in Canada




thanks

Texas_Ace

Unless you have a different truck then the ones in your sig, you have a normal O2 sensor and not a wideband.

TheDurk

Just climb underneath and count cats. Two Cats = Cali. style emissions, which became Federal 50-state in 2001. If your emissions sticker says A/F, TWC(2), HO2S in the top left corner under "TOYOTA", that means it was built with that system (there are other letters but ignore those.) If it says HO2S(2), TWC that means it has the older one-cat system and no A/F.

Don't try and understand the rest of the label, it will just confuse you.

Robb235

Air/Fuel ratio sensor is Toyota's terminology for a wideband oxygen sensor. These have the ability to precisely measure the air fuel ratio. Oxygen sensors are the typical narrowband variety the can only switch between rich and lean.

Sent from my iPhone using YotaTech

harleyman711

thanks