O2 Simulator 94 Cruiser - VA Emissions

[Malleus]

I've seen a few come through with code 26 and the plugs on the sensors were full of corrosion. Cleaned the vehicle side of the plug with contact cleaner and installed OE sensors and the problem went away.

Try this:
https://www.amazon.com/CRC-Plastic-Contact-Cleaner-Aerosol/dp/B000BXKZVA (Lowes and HD sell it too)
I've had good luck with it so far, and it's cheaper than a set of cats...

 

[OTRAMM]

Yep, I use either the CRC or the Liquimoly equivalent when I have it.

 

[Tools R Us]

The OBD 1FZ came with NTK sensors, NTK 24044 and 24080. Are available aftermarket and work well.

 

[amgraham]

In VA it will fail state inspection if it's missing or bypassed emissions equipment (unless the inspector is sloppy).

Is this your daily driver? If it's not then at 25 you also qualify for antique tags. There are limits on mileage and such but no state inspection required. I've run them on my 4runner since it turned 25 but it truly is a weekend vehicle (only road time is running to the gas station or cars and coffee).

 

[ishootcanon]

What brand of o2 sensors do you keep installing? If they are bottom dollar sensors supplied by your local shop that could be one reason they corrode.

The O2 sensors also catch all the liquid and road grime that gets thrown off the PS tire.

Do you make lots of short trips? Never burning the condensation out of the exhaust?

You can always delete the PAiR system and put them in the exhaust manifold.

You may also have a corrosion issue in the O2 harness wiring causing faulty readouts.

OR you may be running rich!

I am not sure I believe a off brand and not OEM. The tech did tell me the 02 sensors were corroded and I did go back and check the code and it does read 26. Thanks for the help/advise.

I've seen a few come through with code 26 and the plugs on the sensors were full of corrosion. Cleaned the vehicle side of the plug with contact cleaner and installed OE sensors and the problem went away.

It was corrosion in the past and it I just checked the codes again it reads 26. I am guessing it is more corrosion. Maybe I just bite the bullet and get the OE sensors. Thanks for the help/advise.

 

[Tools R Us]

...
It was corrosion in the past and it I just checked the codes again it reads 26. I am guessing it is more corrosion. Maybe I just bite the bullet and get the OE sensors. Thanks for the help/advise.

Also, some of the OBD ('93 & '94) harness are poorly routed, prone to rubbing on things, causing intermittent shorts. Carefully inspect those wires back to where they go into the main harness for insulation failures. The O2 sensors are critical in setting engine tune, so need to have them working properly, in other words, the importance is more than emissions. In our experience, the NTK sensors work fine, other aftermarket brands, not so much.

 

[ishootcanon]

Also, some of the OBD ('93 & '94) harness are poorly routed, prone to rubbing on things, causing intermittent shorts. Carefully inspect those wires back to where they go into the main harness for insulation failures. The O2 sensors are critical in setting engine tune, so need to have them working properly, in other words, the importance is more than emissions. In our experience, the NTK sensors work fine, other aftermarket brands, not so much.

Thanks man. I am going to take it to another tech and let him to to check out the harness and route everything back to make sure it all looks good. Will check back in with update as soon as I save up the cash for the OE sensors and labor.

 

[Tools R Us]

Thanks man. I am going to take it to another tech and let him to to check out the harness and route everything back to make sure it all looks good. Will check back in with update as soon as I save up the cash for the OE sensors and labor.

If $$ are tight (when are they not?) can save a few bucks. IIRC the only difference between the two sensors is length of the wires, the longer one is cheaper, and can be used for both locations. Looking at http://www.rockauto.com/en/catalog/...79,exhaust+&+emission,oxygen+(o2)+sensor,5132 The NTK 24044 is $59.79 and listed for both sides, the NTK 24080 is $77.99 and listed for 4-6 bank only. So buying two of the NTK 24044 saves $18.

First determine that the sensor(s) are the problem, if so, in this case, best to replace both.