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Post by Woody Williams on Nov 21, 2019 17:00:33 GMT -5
The "Check Engine" light came on on my 4Runner. I checked it and it was...
O2 Sensor Circuit Bank 1 Sensor 2
I killed the error message but I have to ask - What is it and is it something that can wait until after deer season?
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Post by Pinoc on Nov 21, 2019 17:29:35 GMT -5
It can normally wait but sometimes your O2 sensor will send vault codes to the computer and it might make your engine run poorly. Some O2 sensors are hard to get to and replace some are not.
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Post by beermaker on Nov 21, 2019 18:47:42 GMT -5
I had a 2004 Tundra and the same issue. I bought the sensor and a Haynes or Chiltons repair manual to locate it with. It took longer to get organized than it did to change the part.
I originally went to a dealer and was quoted around $400 for labor and the "special order" part. I called my brother, who works at a Toyota plant, he correctly called B.S. and sent me to the local Autozone. I think I spent less than $100 on the part and maual.
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Post by Russ Koon on Nov 21, 2019 19:10:13 GMT -5
When mine went on my trusty Cherokee, it was the sniffer on the exhaust pipe. Checked u-tubes for the exact location and expected difficulty in doing it myself, and they were spot on. They predicted the main problem being breaking the old sniffer loose and removing it, so I prepared by squirting it well with PB Blaster penetrant and bringing my propane torch and a heavy-duty deep-well six point socket and long breaker bar when I went under the Jeep to try it. That worked out well, because it took just about all I could give it with that equipment to finally get it to budge. After that, it was a simple and easy replacement.
The Jeep had been giving me fits for a few weeks with strange throttle responses. Started and idled just fine, but didn't want to run over about one-third throttle unless it was wide open. Had some things I needed to finish before tackling it, and it took a week or so of diagnosing and waiting for a weather break to do it out in the driveway, so I got kinda used to driving it with the throttle at just over idle or wide open. One advantage to an old 140 HP Jeep, it doesn't get too exciting when you just leave your foot in it for a few seconds as long as you're not in heavy traffic.
My OBD reader showed it had two problems, the exhaust sniffer and the air flow sensor on the intake. Neither were difficult to change out, except for the mentioned stubborn removal of the 02 sensor.
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Post by deadeer on Nov 21, 2019 19:10:39 GMT -5
Easy fix as long as old one comes out cleanly.
Woody, what ever became of your truck when it was hesitating or bogging on acceleration?
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Post by Russ Koon on Nov 21, 2019 19:16:01 GMT -5
Thinking about it now, I also had a length of 2" water pipe under the Jeep that helped me persuade that sensor.
I ordered the parts from Rock auto and they came in the mail in two days. Don't recall the exact cost but I think it was forty-something for both.
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Post by greghopper on Nov 21, 2019 19:57:17 GMT -5
Yeah it can wait.... it may come on and go off on its own.
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Post by Woody Williams on Nov 21, 2019 20:17:36 GMT -5
Easy fix as long as old one comes out cleanly. Woody, what ever became of your truck when it was hesitating or bogging on acceleration? it was a bad crankshaft position sensor. Not sure if it worked loose or just bad. Changed that out and it ran like a charm. |
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Post by 36fan on Nov 21, 2019 21:09:50 GMT -5
When was the last time you changed the plugs?
The O2 sensor normally isn't bad when you get the O2 sensor code. It's normally a sign that you need a tune up. The O2 sensor is reading a temperature that is outside of the specs, typically it's from unburnt fuel from the cylinder making it's way to the exhaust system, and then burns in the exhaust system. Sometimes it's from a dirty mass airflow sensor messing up the fuel/air ratio. Sensor 2 says it's the second sensor, which makes me think the catalytic converter could be an issue.
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Post by Woody Williams on Nov 21, 2019 21:52:38 GMT -5
When was the last time you changed the plugs? The O2 sensor normally isn't bad when you get the O2 sensor code. It's normally a sign that you need a tune up. The O2 sensor is reading a temperature that is outside of the specs, typically it's from unburnt fuel from the cylinder making it's way to the exhaust system, and then burns in the exhaust system. Sometimes it's from a dirty mass airflow sensor messing up the fuel/air ratio. Sensor 2 says it's the second sensor, which makes me think the catalytic converter could be an issue. New catalytic converter October 2018. New plugs and spark plug wires 6 months ago. I’m still getting 19 - 20 mpg so I don’t know. |
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Post by ms660 on Nov 21, 2019 23:19:52 GMT -5
I had an 03 Chevy Tracker that the check engine light came. It was the code for a faulty 02 sensor. I replaced it and the light went off. A week later it came back on to show again bad 02 sensor. After 300K miles I guess the check engine light finally burned out. It ran great all them miles without any problems. Never did like computers on my vehicles.
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Post by 36fan on Nov 22, 2019 9:51:55 GMT -5
When was the last time you changed the plugs? The O2 sensor normally isn't bad when you get the O2 sensor code. It's normally a sign that you need a tune up. The O2 sensor is reading a temperature that is outside of the specs, typically it's from unburnt fuel from the cylinder making it's way to the exhaust system, and then burns in the exhaust system. Sometimes it's from a dirty mass airflow sensor messing up the fuel/air ratio. Sensor 2 says it's the second sensor, which makes me think the catalytic converter could be an issue. New catalytic converter October 2018. New plugs and spark plug wires 6 months ago. I’m still getting 19 - 20 mpg so I don’t know. Dirty fuel injectors? |
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Post by Deleted on Nov 22, 2019 10:19:26 GMT -5
Carbon build up on air intake valve and what 36fan said. That was my issue last week when I was stuck at home. Plus Cylinder 1 fuel injector was bad.
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