O2 sensor/cat converter/stumbling question. 2005 Ram
#1534615
11/18/13 12:53 AM
11/18/13 12:53 AM
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Posts: 4,247 Newfoundland
codfish
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Truck acting up lately. Hesitation on acceleration.
Has the following code.
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
Listed as the O2 sensor after the cat converter. I looked up the sensor on RockAuto and they show 2 sensors. Upstream and Downstream positions.
Would I be looking for the downstream sensor, seeing as how it is after the cat converter?
In the past I have had faulty O2 sensors on other vehicles, and driveabilty usually isn't affected. Hopefully it's this simple.
05 Hemi Ram with 130000km.
Thanks codfish
Last edited by codfish; 11/20/13 10:40 AM.
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Re: O2 sensor question. 2005 Ram
[Re: codfish]
#1534617
11/18/13 02:10 AM
11/18/13 02:10 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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Bank 1 sensor 2 means its the bank where the #1 cylinder is and the 2 is the downstream as you are correct on that. So on a V8 Dodge it would be the downstream sensor on the drivers side. Also check for any bad connection as a high voltage code can be caused by a bad connection in the circuit. Ron
Last edited by 383man; 11/18/13 02:14 AM.
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Re: O2 sensor question. 2005 Ram
[Re: Mass_Mopar]
#1534620
11/18/13 04:49 PM
11/18/13 04:49 PM
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codfish
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Good to know. I replaced the "downstream" sensor and unhooked the battery to clear the code. No more code or light showing and the first short drive seemed fine. So far so good. I got a 7 hour drive tomorrow so we'll see how it goes. Thanks codfish
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Re: O2 sensor question. 2005 Ram
[Re: Dcuda69]
#1534622
11/19/13 10:22 PM
11/19/13 10:22 PM
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codfish
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So. This morning I let the truck warm up for maybe 5 mins before I left on my 7 hour drive across the province. Worked flawlessly. Got to my destination, shut it down and went inside. about 3 hours later, started it up, and drove off. Once again, truck started to hesitate heavily while going up a short but somewhat steep hill. Check engine light flashed on and off this time. . I couldn't stop where I was due to traffic, so I drove to the nearest parking lot. (truck drove fine once the check engine light stopped blinking). I turned the truck off, and checked for any codes by turning the key ahead 3 times in 5 seconds. No codes showing . Hmmm. Started it up, ran a few errands and drove back to the house. Seems to act better once it's up to operating temps. Tomorrow morn I will warm it up good before I drive it to see if it makes a difference. Any ideas or educated guess?? Wife wants me to trade it in. I don't want to, but............. codfish
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Re: O2 sensor question. 2005 Ram
[Re: codfish]
#1534623
11/19/13 10:28 PM
11/19/13 10:28 PM
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Joined: Jan 2003
Posts: 8,410 Highland, MI.
Sunroofcuda
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Maybe the catalytic converter is going bad??? That O2 after the cat monitors the cat. Is the converter overheating (glowing red at full heat) or rattling on a cold start?
No Man With A Good Car Needs To Be Justified
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Re: O2 sensor question. 2005 Ram
[Re: codfish]
#1534629
11/20/13 10:39 AM
11/20/13 10:39 AM
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codfish
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And of course the truck has 2 of everything (upstream and downstream O2 sensors and 2 cat converters.) So will checking the temps of the converters help with finding out which one is going bad? I do have a digital temp gun. Just doing alot of reading on the subject and the symptoms of a faulty cat converter sure do match with what I'm experiencing. codfish
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Re: O2 sensor question. 2005 Ram
[Re: codfish]
#1534630
11/20/13 05:01 PM
11/20/13 05:01 PM
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Joined: Jan 2003
Posts: 8,410 Highland, MI.
Sunroofcuda
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If the substrate inside the cat(s) goes bad - they can break-up or get loose. It's not unusual for the padding around the brick to fail & then the brick gets loose inside - sometimes they can even turn sideways & block exhaust flow. I had a '96 Ram with a bad cat & it rattled like heck on a cold start, but then when things heated up, the rattling stopped - it never threw a code though. Dodge replaced it under warranty - the OE cats are covered for 8 years or 100,000 miles federal law. When the truck is cold, get under it & put a glove on & bang on the cats & see if one of them rattles inside. If it does, the brick is loose & it needs replacing.
No Man With A Good Car Needs To Be Justified
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