check enging light codes?

k9k9 · 01-02-07, 11:31 AM

I have a 1994 LC and the check enging light came on, I jumped te1 /e1 to find out the error code.
Looks like it "26". Does anybody know what this code is?
Thanks

4LLC · 01-02-07, 08:12 PM

code 26 is an air fuel ratio malfunction which is your o2 sensor

k9k9 · 01-02-07, 08:40 PM

Im going to replace the 02 sensors
thanks

Capocaccia · 01-03-07, 12:53 AM

Haha I think everyone has that code.

k9k9 · 01-05-07, 01:46 PM

Been driving around for the last few days with the check enging light on (code 26) and today when I drove it the light went off. WTH?
Can the 02 sensor work and then not work then work?

I ordered the parts from "CDan" already so no mater I will install new 02 sensors.

CJF · 01-05-07, 02:06 PM

Quote:

Originally Posted by Capocaccia

Haha I think everyone has that code.

More likely just everyone who's still running around with their original sensors. O2 sensors degrade and wear out, like spark plugs. And, again like spark plugs, performance suffers when they're old. (Toyota Maintenance Schedule says replace every 80k.)

k9k9: If your sensors are old, you'll be glad you're replacing them, regarless of whether you have a CEL code. (They don't usually throw a code unless they're really bad.) Do you keep good track of your mileage? It will likely improve after replacement.

Curtis

UpsideDown · 01-05-07, 11:44 PM

Quote:

Originally Posted by k9k9

Been driving around for the last few days with the check enging light on (code 26) and today when I drove it the light went off. WTH?
Can the 02 sensor work and then not work then work?

I ordered the parts from "CDan" already so no mater I will install new 02 sensors.

Codes can come and go... as far as the CEL is concerned. The computer will show a light when there is a fault, and when the fault does not show up for a few cycles (start, drive, stop) then the computer extinguishes the light but the codes exists as a "memory code." The computer will also show "pending codes" to a scanner... these are ones that may show up as a CEL in the future if the problem persists.

If you're getting some new HO2S then you should do a propane test on them before installation. In my shop, I am finding that a fair number of new sensors do not work right out of the box. Sensors are sensitive to being dropped, etc...

I would also suggest that you consider replacing your HO2S when they are a problem, rather than as a routine (they can be quite expensive - since there are probably 4 of them in your application).

~John

k9k9 · 01-06-07, 09:47 AM

"If you're getting some new HO2S then you should do a propane test on them before installation. In my shop, I am finding that a fair number of new sensors do not work right out of the box. Sensors are sensitive to being dropped, etc... "

How do you do a propane test?

UpsideDown · 01-06-07, 02:08 PM

Quote:

Originally Posted by k9k9

How do you do a propane test?

to save time (I type slowly), I'm just pasting from: http://www.mr2.com/TEXT/O2_Sensor.html

Testing O2 sensors on the workbench.

Use a high impedence DC voltmeter as above. Clamp the sensor in a vice, or use a plier or vice-grip to hold it. Clamp your negative voltmeter lead to the case, and the positive to the output wire. Use a propane torch set to high and the inner blue flame tip to heat the fluted or perforated area of the sensor. You should see a DC voltage of at least 0.6 within 20 seconds. If not, most likely cause is open circuit internally or lead fouling. If OK so far, remove from flame. You should see a drop to under 0.1 volt within 4 seconds. If not likely silicone fouled. If still OK, heat for two full minutes and watch for drops in voltage. Sometimes, the internal connections will open up under heat. This is the same a loose wire and is a failure. If the sensor is OK at this point, and will switch from high to low quickly as you move the flame, the sensor is good. Bear in mind that good or bad is relative, with port fuel injection needing faster information than carbureted systems. ANY O2 sensor that will generate 0.9 volts or more when heated, show 0.1 volts or less within one second of flame removal, AND pass the two minute heat test is good regardless of age. When replacing a sensor, don't miss the opportunity to use the test above on the replacement. This will calibrate your evaluation skills and save you money in the future. There is almost always *no* benefit in replacing an oxygen sensor that will pass the test in the first line of this paragraph.

k9k9 · 01-16-07, 01:21 PM

Just wanted to give an up date, No more CEL.
I installed new 02 sensors with the help of CDan for parts. A pleasure to deal with I might add.
The swap out was very easy, bolts were not rusted and besides having to lay in funky angles to get the sensors in and out, it was a breeze.
My 94LC is running great once again.
Thanks for the help from this board.

01-02-07, 11:31 AM	#1
k9k9 IH8MUD Rookie Join Date: Dec 2006 Location: phoenix Posts: 24	check enging light codes? I have a 1994 LC and the check enging light came on, I jumped te1 /e1 to find out the error code. Looks like it "26". Does anybody know what this code is? Thanks Last edited by k9k9; 01-02-07 at 11:38 AM.

01-02-07, 08:12 PM	#2
4LLC IH8MUD Junior Join Date: Dec 2005 Location: wisconsin TLCA# 15923 Posts: 132	code 26 is an air fuel ratio malfunction which is your o2 sensor __________________ same stuff differant 80

01-03-07, 12:53 AM	#4
Capocaccia IH8MUD Addict Join Date: May 2006 Location: Memphis Tennesse Posts: 850	Haha I think everyone has that code. __________________ 1996 LX450. 33" BFG A/T TA KO, TJM T17, OME 2.5 Hvy, Warn X8000i ATΩ

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01-02-07, 08:40 PM	#3
k9k9 IH8MUD Rookie Join Date: Dec 2006 Location: phoenix Posts: 24	Im going to replace the 02 sensors thanks

01-05-07, 01:46 PM	#5
k9k9 IH8MUD Rookie Join Date: Dec 2006 Location: phoenix Posts: 24	Been driving around for the last few days with the check enging light on (code 26) and today when I drove it the light went off. WTH? Can the 02 sensor work and then not work then work? I ordered the parts from "CDan" already so no mater I will install new 02 sensors.

01-06-07, 09:47 AM	#8
k9k9 IH8MUD Rookie Join Date: Dec 2006 Location: phoenix Posts: 24	"If you're getting some new HO2S then you should do a propane test on them before installation. In my shop, I am finding that a fair number of new sensors do not work right out of the box. Sensors are sensitive to being dropped, etc... " How do you do a propane test?

01-16-07, 01:21 PM	#10
k9k9 IH8MUD Rookie Join Date: Dec 2006 Location: phoenix Posts: 24	Just wanted to give an up date, No more CEL. I installed new 02 sensors with the help of CDan for parts. A pleasure to deal with I might add. The swap out was very easy, bolts were not rusted and besides having to lay in funky angles to get the sensors in and out, it was a breeze. My 94LC is running great once again. Thanks for the help from this board.