The check engine light is on. I have replace one of the sensors but the light is still on. I replaced sensor one.
The light will remain on until you reset it with a scan tool.
SOURCE: 2001 Sienna VSC/Trac/Engine Light
Toyota Specific Trouble Codes
P1135
Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)
If you have changed the proper sensor then you may need to have the cam shaft looked at.
SOURCE: Check engine light won't stay off
you could have a short in your o2 sensor wire and there for its not reading.Get a shop to hook up a diagnotic scanner and read what they are doing so you can see if its a loss of comunication or not and then go from there.Also make sure it was factory replacement o2 sensors and not one of those multifit jobs.
SOURCE: Check engine error code P0155
If you used the type you splice the wires, recheck the wires. Sensor 1 should have been the one up closest to the exhaust manifold. I prefer to pay $30 more and get the OEM plug-in type. You might try disconnecting the battery for a while.
SOURCE: check engine light on 2003 toyota tacoma, O2 sensor?
An O2 sensor code is a tricky one. It could mean SEVERAL different things, and I know how bad it sucks to hear this, but your best bet is to take it in and have a diagnostic ran on it at either a dealer or a good mechanic shop with a computer they can hook up to it. I had an "O2" code come up a while back on another car I used to have, and literally spent weeks and hundreds of dollars trying to fix it, and never did. Finally out of desperation took it in, paid the $90, and they found the problem and fixed it in like 30 minutes. Something I would have never even thought of was causing it (can't remember off the top of my head). After that I stopped wating time and money on check engine lights. One comes on in my car, I take it to have it ran for free at and auto parts store just to make sure it's not a loose gas cap or something, just to get an idea of what I'm looking at, then go and make an appointment to have to hooked up to a diagnostic computer to track down the problem. Good luck, and hope this helps save you some time and money.
SOURCE: replaced mass airflow sensor in 2001 tacoma twice.
If the new unit only lasted a couple of months, and the engine light goes back on, I think that you should try to have it replaced at the auto parts store under their 90 day warranty policy, if they have that.
Try to go to a reputable source such as Autozone or Advance Auto Parts where they have a more liberal return and refund policy.
Usually, a MAF sensor once replaced shouldn't go bad in such a short time span.
Maybe, check that the voltage to the MAF sensor is not too much for the sensor, causing it to go bad. If that's the case, the computer reference signal voltage may be the culprit.
Good luck on this repair.
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