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P0138 Code on a single exhaust

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Old 09-28-2012, 02:27 PM
chinsstter chinsstter is offline
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Default P0138 Code on a single exhaust

Please help. I'm getting a P0138 code on my truck. Its a 5.7 Hemi 4x4. I read what the code means which is O2 Oxygen Sensor Circuit High Voltage Bank 1, Sensor 2. Problem I'm having is that I only have one exhaust pipe. Can anyone tell me how to solve this riddle. I spoke to the dealer and by pulling my VIN it tells them I should have two exhaust pipes. Your help is always appreciated.
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Old 09-28-2012, 02:37 PM
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broggyr broggyr is offline
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Did you buy the truck used? If so, the previous owner may have modded the exhaust. I would see if the sensor exists; I would imagine that both O2 sensors would be installed to the same pipe if there was only one...
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Old 09-28-2012, 03:06 PM
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High Voltage Means you are Running rich (More gas being delivered than suppose to)Your Post Cat o2 senosor is prolly going out, What year is your tuck? If its past a certain year you have 4 o2 sensors instead of 2.
Rockauto.com has them for half the price of parts stores. Make sure if you do buy a new one that the brands match or you will have more problems.

After you replace the sensor your truck will thank you with some better MPGs
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Old 09-28-2012, 04:23 PM
chinsstter chinsstter is offline
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I did buy the truck used, and the sensors (both) are still their. In regards to the year its an 03 mfr date 5-03.
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Old 09-28-2012, 04:24 PM
p38251 p38251 is offline
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you should have 1 pipe on each side off the exhaust manifolds. sensor 2 is after the cat. bank 1 I believe is the passanger side. Willdikem66 is correct should be 4 o2 sensors total. It is still single exhaust. Also known as 2 into 1.
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Old 09-28-2012, 04:50 PM
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Only 2 o2 sensors on your 03 thank god, 30 bucks for the sensor and you will be back on the road.
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Old 09-28-2012, 04:50 PM
 
 
 
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