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O0137, P0138
05-04-2010, 10:41 AM
Post: #1
O0137, P0138
04 Dodge Ram 1500, 3.7 v6, manual transmission, 31,000 miles

in Feb 2010 I got the p0137 error code and replaced the down ward O2 sensor.

on April 29 2010 I got the p0138 error code and replaced that same sensor, replaced spark plugs and pcv valve.

now May 03 2010 I got the same p0138 error code again...

The O2 sensor is a Boush unit....

What do you think it is????

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05-04-2010, 11:46 PM (This post was last modified: 05-04-2010 11:48 PM by Rupe.)
Post: #2
RE: O0137, P0138
Generally speaking a code for an O2 sensor is not a call for replacement but is a sign of other troubles with mixture, exhaust, or intake leaks / clogs. The codes are generally set if one of the sensors is out of range for too long, which can happen while pulling up a long grade with a load or trailer. (that's happened to me) OTOH, a code for the down stream sensor can mean the cat converter is not doing it's job or is partially restricted.

Here's a few links to ponder. Lots of in depth tecno-chatter to absorb and maybe something will help.

Let us know how you make out.
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05-21-2010, 02:16 PM (This post was last modified: 05-21-2010 03:34 PM by Chuck_thehammer.)
Post: #3
RE: O0137, P0138
Thanks for the links...
how can a cat go bat in 31,000 miles...
bank 1 sensor 2,,, is it the right side or the left side... #1 cylinder is on the left side CORRECT...
this truck has 2 cats, 2 pre-cat o2 sensors and 2 post-cat o2 sensors...
I read somewhere that I should use only Dodge O2 sensors as the after market ones are to slow... TRUE????
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05-21-2010, 10:18 PM
Post: #4
RE: O0137, P0138
Bank one is whatever side the #1 plug is on so just to verify stand on the side and eyeball which bank is farther forward.

Not sure how different brand sensors compare but if they meet OEM standards, which is critical for emissions parts certification, I would say it should not be a real issue to use something from the aftermarket.

You ask how can a cat go bad in 31,000 miles? If it's not running right a cat can go bad in a few hundred miles. OTOH, I would read the owner's manual closely to see if you are under warranty for certain items. In many states emissions related parts are no longer limited to 5 year 50k miles like in the old days.
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