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You are watching: 2004 toyota tacoma o2 sensor bank 1


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Truck idles very low, surges, and sometimes stalls at idle. I took it to Autozone and they put the scan tool to it and told me it read "o2 sensor, bank 1, sensor 1, low input". Didn"t tell me the code number. I"m assuming that means the front sensor is bad. If so, I will definately get one from URD, but is there something else I should check before getting a new sensor?Thanks!
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A dirty MAF sensor will give out the same code. Clean the MAF and throttle body, reset and try it out..
I"m proud to have had the privilidge to meet some of the greatest CT"zens in the world. At mini-meets, meet n greets, car shows and TacOberFest. It all started right here..

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I cleaned the MAF, the throttle body, and my air filter. Checked for vacuum leaks and replaced the vacuum hose to the S/C bypass valve. It had cracks at the connection to the intake, but I don"t think it was causing a leak. Check engine light went out. Truck still idles down real low, surges (hunts) and sometimes stalls when the engine is warm. Idles fine when cold. I took it back to Autozone and no fault codes come up. Could it be a throttle position sensor going bad? AZ guy thought it could also be the idle air valve.....??? :shrug: The idle air valve is almost $200 and I don"t want to throw parts at it unless I"m pretty sure they"re the right parts. Any ideas?
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It could be the front O2 (air/fuel) sensor. I"d drive it for at least 100 miles, since you reset the ECM and let it re-learn everything. And, after 100 miles if the CEL comes on again, then you know the front sensor is probably bad.. I doubt its the TPS..
I"m proud to have had the privilidge to meet some of the greatest CT"zens in the world. At mini-meets, meet n greets, car shows and TacOberFest. It all started right here..
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How should I clean it? When I cleaned the TB I squirted TB cleaner into the hole that goes into the ACV at the bottom of the TB. Do I need to take it apart or squirt cleaner into the vacuum (?) hose connection that goes into the ACV?
I just put a K&N Cold Air Intake on my "04 D-Cab 3.4L, and I am having the same problem. One thing extra I do notice though. My driveway has a slight grade to it. If I am in my driveway the rough idle will recover once it gets to around 400RPM"s. When on flat ground, it will pretty much stall. Also, do you have an Automatic or Standard. Mine is Automatic, don"t think it would make a difference, but with a Standard Tranny, I could see it being easier to throttle it up with your foot when stopped at a red light.
My 2000 3.4L is having the same problem, check engine light"s been on since I bought ir four months ago and in the past month it"s been surging and stalling when I go from accelerating to neutral. I"m putting in new o2 sensors this weekend but I"m wondering if theres something else that may be causing it.

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Here"s some tips on troubleshooting the front sensor.http://www.barisalcity.org/forum/showthread.php?t=87146
Old truck - S/C"ed 2000 2wd 3.4L V6 Xtracab SR5 :burnout:I"m going to Twitter your Yahoo until I Google all over your Face...Book.
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