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O2 sensor replaced, Check engine light came back

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Old 02-21-2012, 02:14 PM   #1
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O2 sensor replaced, Check engine light came back

Hi all

So i replaced my O2 sensor yesterday. The Bank 1 sensor 2. Everything when fine. I cleared the alarm with my OBD2. Now today on my way home from work, the check engine light came back one and yes, it is the same alarm. Sensor O2 Bank 1 Sensor 2.

??????? Should i just burn the truck and buy a new one?????

Joke aside, i dont know where to go now for troubleshooting...

Any takers ?
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Old 02-21-2012, 02:18 PM   #2
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Check the wiring isn't pinched or burned especially around hot areas of the engine. Also exhaust leaks or restrictions. EVAP emissions system or fuel pressure.
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Old 02-21-2012, 02:38 PM   #3
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all right !! ill check that out. could fuel pressure really do that ??

Also, for more info, my OBD2 says i'm in the yellow for emission control. (if that means anything) and i have four lights flashing on it.. one is the O2S, Cat, and two others that i have no idea...

cheers
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Old 02-21-2012, 03:29 PM   #4
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on any car i have had i always unhook the battery for 30mins to reset it.
its the old fashion way, but that is the way i am. don't know if this helps.
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Old 02-21-2012, 03:43 PM   #5
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Nice !! the good ol redneck way... But yeah, i can reset it with my OBD2 but it keeps coming back... thanks anyways
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Old 02-21-2012, 04:20 PM   #6
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I replace oxygen sensors in pairs. If one is bad, chances are the other one is failing too.
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Old 02-21-2012, 05:36 PM   #7
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What brand O2 sensor did you buy? Denso is the only way to go on these trucks.

I replaced mine about 6 months ago, and the light came on about 3 more times over a few hundred miles. I reset it each time, and it has now quit coming on.
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Old 02-21-2012, 05:46 PM   #8
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i went back and forth trying to fix the same problem... replaced both sensors twice over a couple years... now the only way i can keep the CEL off is if i run premium gas. if i fill up with regular the light will be back on by the end of the tank and it will take about 1-2 tanks of premium before it stays off. i've tested it several times and it happens like this every time.... i just figure the truck is getting picky in its old age.
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Old 02-21-2012, 06:13 PM   #9
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Advance Auto, Autozone, or O'Reilly Auto Parts will do a code reset for free... Could just be a fluke with the sensor tripping... Try having it reset once or twice and see if it comes back on, if so, replace the sensor with a OEM.
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Old 02-21-2012, 06:39 PM   #10
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thanks everyone, will try your tricks for a lil while and see. I bought that sensor off ebay and i dont even know what kind it is. Ill buy a denso if that doesnt work.
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Old 02-22-2012, 05:18 AM   #11
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try rockauto.com

they have very good prices. i get all my OEM replacement parts from them.
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