Engine light - Drive-start control Malfunction Visit your dealer

[127.0.0.1]

air fuel sensors are generally pretty standard and you should have one fast

an O2 sensor and an Air/Fuel sensor are essentially cousins of each other.

O2 sensor basically is an on/off signal....is exhaust clean enough or not.
sniff* outside air, and compare that to the exhaust stream and send a signal.
This simply triggers emissions codes.

Air/Fuel sensor is sniffing* outside air and exhaust too, but sending precision measurements of fuel burn, and has direct use on the engine ECU and fuel management to keep the burn as close to stoichiometric as possible under all running conditions.
about 14.7 parts air to 1 part fuel is the ideal ratio for complete combustion

This A/F sensor is nothing special to the 4runner I bet the same part number works
on many other Toyota engines. If they aren't readily available it would be a surprise

*sniffing...they have exposed membranes which measure outside oxygen, this way
they have something to calculate a ratio against. and is actual to the available oxygen in that location

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[perryj101]

@Lamuncha FYI the part number is 89467-60270 Air Fuel Ratio Sensor. A quick check online shows availability. Your dealership should be able to get their hands on one fairly quickly.

 

[Lamuncha]

I understand the check engine light illuminated if there was a fault in the air/fuel ratio sensor.
Why would a "drive-start control malfunction" pop up?
Why would the front and rear radar shut down?
Why would cruise control shut down?
Why would the auto start/stop function shutdown.
It seems excessive unless something else is happening- I guess.

 

[Lamuncha]

thanks perryj I may have to buy it and give it to them......

Situation is strange.

 

[brumey]

Go to another dealer.

 

[127.0.0.1]

I understand the check engine light illuminated if there was a fault in the air/fuel ratio sensor.
Why would a "drive-start control malfunction" pop up?
Why would the front and rear radar shut down?
Why would cruise control shut down?
Why would the auto start/stop function shutdown.
It seems excessive unless something else is happening- I guess.

many single faults trigger a laundry list of 'common other faults' usually
trac, TSS, other odd stuff because it puts you in cripple mode to some extent
it's how Toyota does it and common across all Toyota vehicles

 

[Nodak]

since they are all tied into the ECU, the TSS 3.0 is also tied into it, so those system would go offline if there is a fault in the ecu (radar cruise control, LTA, etc), its a fail safe so those system dont try to engage if the ecu cant properly control the engine.

 

[Lamuncha]

Seems there are two of these sensors, perryj's part number is the one that has failed. As of this morning there are none, all backordered.
Waiting to hear what that means.
Talked to several dealers in various parts of the country, none in stock.
This particular sensor has been used since the model T.
Go figure.
The part is made for Toyota by Denso which is written on the Toyota part. They are available (under the Denso part number).
Novel idea, why not put the Denso unit in?
Because Toyota will not warranty it.
So do I want to get into pi--ing contest with Toyota? Pretty sure everything that happens to the car during warranty, including flat tires, will be blamed on the "non Toyota" part.
And so it goes.
Not sure if escalating this to regional Toyota to get permission to use a non standard part would be next step if that Toyota part is not available for a while.

 

[127.0.0.1]

there is the DENSO one and the TOYOTA one and for sure when it comes
to O2 or A/F on Toyota, you want the Toyota one with toyota part number.
bad luck and endless codes await those who try to think outside the box
when it comes to sensors and engine management on a Toyota.

I tried it on my '99 a couple times and got hosed. 3 months later my savings
went down the drain as I sheepishly went to dealer to get the OEM goods. never again

Toyota forums in general for all models have the same story...maybe you can get away
with equivalent sensors but more often you end up paying + 1 1/2 when you keep getting burnt

 

[Lamuncha]

Of course You are 100% correct and thanks for bringing me back to ground. Likely the Toyota part is spec'd for a more rigorous life.
Unfortunately there are none that can be found in the States and no ETA yet on the one ordered.
Not sure how their distribution system works but the pipeline has to fill, backorders satisfied, etc, etc.
The nonchalant attitude of the dealer is of course PITA as well.
Thanks

 

[brumey]

Maybe they should provide a loaner?

will running it cause more damage while waiting for a part?

 

[shaqinfatak]

I had similar issues at 500 miles. It was air fuel sensor malfunction. Dealer changed it for free. It was under warranty. But it took 2 weeks to ge the part since it was on back ordered. At 1600 miles now, no problem after that.

 

[perryj101]

If the sensor is defective and if you are running lean or running rich, you don’t want to run in that condition for an extended period of time.

 

[Archer]

This is ridiculous, with a company like Toyota and their decades of making automotive machinery you'd think if their going to put out a first run vehicle to the general public and charge 50K-60K-70K for them they sure as hell would have replacement parts. If not, they shouldn't put them out into the market until they do.

I'm waiting on a windshield, they told me they have no idea when it's going to be available, OEM or aftermarket dealers. Could be quit awhile they said.

Got blasted by dirt on a hgwy. from the bed of a 10 wheeler w/o a tarp and it sandblasted my windshield. Doesn't look bad during the day but at night with on coming traffic and when the sun is setting it's almost unusable.


Arggggggh.

.

 

[127.0.0.1]

Maybe they should provide a loaner?

will running it cause more damage while waiting for a part?

the risk of driving with bad a/f is

running rich and clogging up the system with carbon,
or running lean and melting engine parts

Loaner is the answer here since it is a 3/36 defect

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