Hey guys, I am creating this thread not because I have a technical issue, just for the sake of curiosity. I hope you guys don't mind that I am bringing up a different series land cruiser in the 80 series section, its just that there is no other section with 1FZE experience.
When I say FJZ100L I mean: Middle east spec 1998-2007 100 series land cruiser which came with the GEN 2 1FZE same as the LC105 expect its IFS.
So I have been reading posts here in the 80 series section about oxygen sensors, and I cant help but wonder why many or all posts that I read claim that the 1FZE requires oxygen sensors to "run properly". While all of my experience with land cruisers equipped with the 1FZE (the GEN 2, or the 105 series/FJZ100L 1998+) run without oxygen sensors at all.
NOTE:
1. All GEN 1 1FZEs on 80 series land cruisers here in Qatar come with no oxygen sensors from the factory. I know this for sure because when I went to buy OEM exhaust manifolds for my FJZ100L last year at the Toyota spare parts store, the salesman asked me weather I wanted a manifold with a hole for the oxygen sensor or not. 1998+ FJZ100Ls come with the ports for oxygen sensors while 80 series manifolds do not come with oxygen sensor ports.
2. Out of all the people I know who own the FJZ100L run no oxygen sensors including me, the significant portion are running long tube headers however some run the factory exhaust manifold with the hole for the oxygen sensor plugged.
NOTE: I do understand the importance and the function of upstream oxygen sensor. It measures the air fuel ratio and feeds the info to the ECU to ensure "proper" or optimal operation.
So my real question is, why is it that an older, and simpler 80 series with the GEN 1 1FZE require a oxygen sensor to run properly, and the newer 1998+ FJZ100 with the *newer* GEN 2 1FZE does not ?.
I also read that the 80 series triggers a check engine light for you guys when there is a problem with the oxygen sensor. For us both the FJZ100L and the 80 series do not trigger the check engine light without the oxygen sensor. However when you install a OBD scanner, it does prompt an error that there is a fault with the oxygen sensor.
More importantly they seem to run perfectly fine ? No rough idle, no excessive fuel consumption. No signs of a excessively rich air fuel ratio (by checking spark plugs). The issue is I have not tried to buy a new O2 sensor and connect it to identify if there is a noticeable difference in how it runs. This is what I will be doing in the incoming week. I bought a new O2 sensor and will be wielding a whole in the exhaust and plugging it in to test.
My speculation to why: Middle east, Qatar especially does not have strict emissions requirements at all, which is why they are hardwired to not require the oxygen sensor. During the production of the FJZ100L (1998-2007), Qatar did not even have any emissions requirements.
Part number of the oxygen sensor that I purchased from Toyota spare parts: 89465-60260
Link: 02 Oxygen Sensor For Toyota Landcruiser FZJ100L 1998-2007 89465-60260 | eBay - https://www.ebay.com/itm/02-Oxygen-Sensor-For-Toyota-Landcruiser-FZJ100L-1998-2007-89465-60260-/164031753726
Image of the codes that appeared after scanning with an OBD scanner yesterday. Basically the same result of all the FJZ100Ls that I have scanned (in exception to the crankshaft position sensor). The MAF which is located in the intake manifold is the only component that is required(of course, otherwise the ECU would be completely blind). Unlike the 80 series which has a MAF attached to the air cleaner. The air temp sensor is an additional small sensor available in the FJZ100Ls which is never actually used here. Nobody runs it or so it seems from the hundred of cruisers I have seen.
When I say FJZ100L I mean: Middle east spec 1998-2007 100 series land cruiser which came with the GEN 2 1FZE same as the LC105 expect its IFS.
So I have been reading posts here in the 80 series section about oxygen sensors, and I cant help but wonder why many or all posts that I read claim that the 1FZE requires oxygen sensors to "run properly". While all of my experience with land cruisers equipped with the 1FZE (the GEN 2, or the 105 series/FJZ100L 1998+) run without oxygen sensors at all.
NOTE:
1. All GEN 1 1FZEs on 80 series land cruisers here in Qatar come with no oxygen sensors from the factory. I know this for sure because when I went to buy OEM exhaust manifolds for my FJZ100L last year at the Toyota spare parts store, the salesman asked me weather I wanted a manifold with a hole for the oxygen sensor or not. 1998+ FJZ100Ls come with the ports for oxygen sensors while 80 series manifolds do not come with oxygen sensor ports.
2. Out of all the people I know who own the FJZ100L run no oxygen sensors including me, the significant portion are running long tube headers however some run the factory exhaust manifold with the hole for the oxygen sensor plugged.
NOTE: I do understand the importance and the function of upstream oxygen sensor. It measures the air fuel ratio and feeds the info to the ECU to ensure "proper" or optimal operation.
So my real question is, why is it that an older, and simpler 80 series with the GEN 1 1FZE require a oxygen sensor to run properly, and the newer 1998+ FJZ100 with the *newer* GEN 2 1FZE does not ?.
I also read that the 80 series triggers a check engine light for you guys when there is a problem with the oxygen sensor. For us both the FJZ100L and the 80 series do not trigger the check engine light without the oxygen sensor. However when you install a OBD scanner, it does prompt an error that there is a fault with the oxygen sensor.
More importantly they seem to run perfectly fine ? No rough idle, no excessive fuel consumption. No signs of a excessively rich air fuel ratio (by checking spark plugs). The issue is I have not tried to buy a new O2 sensor and connect it to identify if there is a noticeable difference in how it runs. This is what I will be doing in the incoming week. I bought a new O2 sensor and will be wielding a whole in the exhaust and plugging it in to test.
My speculation to why: Middle east, Qatar especially does not have strict emissions requirements at all, which is why they are hardwired to not require the oxygen sensor. During the production of the FJZ100L (1998-2007), Qatar did not even have any emissions requirements.
Part number of the oxygen sensor that I purchased from Toyota spare parts: 89465-60260
Link: 02 Oxygen Sensor For Toyota Landcruiser FZJ100L 1998-2007 89465-60260 | eBay - https://www.ebay.com/itm/02-Oxygen-Sensor-For-Toyota-Landcruiser-FZJ100L-1998-2007-89465-60260-/164031753726
Image of the codes that appeared after scanning with an OBD scanner yesterday. Basically the same result of all the FJZ100Ls that I have scanned (in exception to the crankshaft position sensor). The MAF which is located in the intake manifold is the only component that is required(of course, otherwise the ECU would be completely blind). Unlike the 80 series which has a MAF attached to the air cleaner. The air temp sensor is an additional small sensor available in the FJZ100Ls which is never actually used here. Nobody runs it or so it seems from the hundred of cruisers I have seen.
Last edited: