17 hours ago, AlphaMZ said:

where's the oxygen sensor fuse located?

 

There may not be a fuse just for the oxygen sensors but there's more than one Engine Computer fuse in the list here:

Having read the list, there doesn't seem to be a fuse for each sensor so it's unlikely that is the cause is a fuse otherwise you would get two P-codes.

18 hours ago, AlphaMZ said:

where's the oxygen sensor fuse located?

 

It's definitely fuse 8 in main engine compartment....but it's definitely not a fuse problem. You can see in the attached diagram that the sensor heaters share a fuse with a bunch of other stuff including the fuel pump. If the fuse had gone you wouldn't be able to start the engine.

 

 

The oxygen sensors are connected directly to the ecu so more than likely it's the sensor itself or a fault in the wire or plug.

4 hours ago, MonsterS said:

a fault in the wire or plug

thanks for your input @monsters; will get that looked at as the sensor is newly fitted, so it can't be that; even the old one looks fine, so electrical testing is the way to go it appears!

On 1/8/2023 at 4:33 PM, starider said:

the heater ducts were blocked with leaves and crud, cleared out and management light went out.

thanks for this suggestion @starider; where are these in the Alphard?

The Sensor that was put on last week had a part number: 8946758090

but I've just looked at the one that came off, and it's with Toyota OEM P/N:  89465 58050

could this be the cause as to why it hasn't fixed the issue?

 

can some kind soul please advise as it's doing my head in?

2 hours ago, AlphaMZ said:

can some kind soul please advise as it's doing my head in?

I think only Toyota, DENSO or the part supplier can answer the question. Part numbers can change due to improved design or cost reduction. It does not necessarily mean they are incompatible but it's impossible to tell.

 

Did you check you had replaced the correct sensor by disconnecting the other one?

Thanks, @Geralt My Mechanic will have a look tomorrow, and I'll tell him to switch with the exhaust sensor and see what happens.

 

The one that I replaced the original with was this one off ebay:

https://www.ebay.co.uk/itm/332795306219

 

since changing it, I now see on the listing of compatible OE numbers as follows:

 89465-0D040, 89465-05100, 89465-06030, 89465-06250, 89465-10070

 

you'll notice my original OE number isn't listed, so makes me now wonder if that's the issue?

 

I've now got another Toyota sensor 89465 58050 to go into it tomorrow!