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aaron weather
Dodge Dakota
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7/27/2002
22:12:32
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 Subject: Code p0138
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Could anyone please tell me what this code is? I looked it up on the PT Cruiser web site but it wasn't listed. Any hints would be great!! Thanks!
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CW
GenIII
7/27/2002
22:33:57
|  RE: Code p0138
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Upstream O2 sensor suck obove center (rich). Try replacing the O2 sensor before the cat.
2001 4.7HO RC 5sp 3.92 LSD
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MaDgamEr
Dodge Dakota
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3/25/2004
19:35:52
|  RE: Code p0138
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Hmm... P0138 is bank 1 sensor 2, which makes it the DOWNSTREAM O2 sensor, no?
I know its an old post, but I was just looking for clarification on this... anyone?
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Joey
Dodge Dakota
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3/25/2004
20:37:33
| RE: Code p0138
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i got this code once on my truck but it has the o2 simms. i dont know why it happened but after a while it went away. anyways, its the downstream sensor on bank #1 voltage is too high.
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ticats
Dodge Dakota
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3/26/2004
07:00:31
| RE: Code p0138
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It depends if it is a California truck or not.
If CA truck (VIN W), then it's the pre-cat sensor.
If Fed truck (VIN 3, B, J, L , R, T, X, Y or Z) then it's that after cat sensor.
ticats, ontario, canada
97 Dak CC Sport, 5.2L, 44RE, 4.56 SG, race weight 4,120 lb., 13.98 @ 99.85 (650' elevation)
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MaDgamEr
Dodge Dakota
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3/26/2004
08:45:45
| RE: Code p0138
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Ok, makes sense...
ticats, I got a question for ya, have you had your cat converter replaced under the emissions warranty in Canada by any chance?
Mine is rattling like a mofo and last year it BARELY passed NOx on the "drive clean" test, but all other emissions were fine! And dodge is being a real jerk about replacing it. I took it in and they said yeah, its rattling but its still working, we did a visual inspection and there was nothing wrong. Long storry short, they don't wanna replace it just because its rattling...
On top of that, I recently replaced the downflow o2 sensor with the designated Mopar replacement unit (suspect it died due to a dying converter, code P0137), not more than 24 hrs later, the same one died again!! This time codes P0138 & P0141, voltage too high and heater circuit malfunction. Any chance this was caused by a dead (or near dead) cat converter??
I just wanna get to the bottom of this... seems like you guys in the US don't have too much of an issue getting defective converters replaced, but here in Canada, they make it damn near impossible, even with OBVIOUS simptoms... and to top it all off, I only have about 5,000 km left on the emissions warranty.
If anyone has any advice on any of these matters, I'm VERY open to suggestions...
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ticats
Dodge Dakota
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3/26/2004
16:02:32
| RE: Code p0138
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MaDgamEr ... no, so far it's held up (fingers crossed). AFAIK, O2 sensors usually go bad because of failure in the heating unit. The rear ones seem to be more likely than the front ones. Most of the time their response time just slows from accumulated contamination over time until they fall outside of the computer's programmed specs. You sure have had unlucky experiences with them :-(
I can think of only two options regarding trying to get your cat replaced before the emissions warranty expires, neither of which I personally find very attractive.
If you haven't done so or are in a location where you can do so, try taking it to another dealer. Replacement is a judgment call by the service manager on iffy situations. You may luck out somewhere else.
The second is try and speed up its failure in the short time that you have left.
You probably can't open up the exhaust to get at the cat and break up the substrate more with a pipe without it being visible to the naked eye. You could try hitting the cat at various locations with a rubber mallet in hopes of breaking up the substrate more and then do extended periods of idle in hopes that the hot temperature begins fusing the substrate.
If parts of the external cat look a little rusty (most likely at the in/out pipes location or along the seams), you could find the smallest diameter, metal drill bit and drill some holes into the casing. Then spray around the area with a mix of vinegar and water to get the edges around the holes to rust quicker.
Raw gas in the substrate is a quick killer but is dangerous.
I have a friend with a 4x4 that went through a water pit and accidently trashed the cat. Cold water on a hot cat just fractured everything inside. I don't know if the water was deep enough to get to the cat through the exhaust pipe or if everything just broke up from thermal shock on the hot surface. The only thing that he was asked at the dealer was if he had gone through a deep puddle. You know how he answered :-)
ticats
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MaDgamEr
Dodge Dakota
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3/26/2004
16:42:05
| RE: Code p0138
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Thanks for the suggestions ticats, but rather than screw the converter and possibly have them find out, I think I'll go do an emissions test and "help" it fail... after that they won't have a choice, will they?
I mean, it already almost failed last year due to the high NOx levels... sigh, I HATE this bs. "Its broken, but not completely broken, so we're not gonna fix it until it is completely broken". Not to mention the BS of a "visual" inspection of the cat converter's performance.. How the HELL do you "visually inspect" the working condition of an emissions component?!?
Sorry about the rant, just getting sick and tired of their excuses.
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ticats
Dodge Dakota
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3/26/2004
17:03:33
| RE: Code p0138
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I sympathize with your frustrations. They're probably looking for signs of leaking on the visual inspection, much the same as they do for the muffler and pipes. Good luck to you!!!
ticats
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MaDgamEr
Dodge Dakota
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3/30/2004
19:10:23
|  RE: Code p0138
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Well, I replaced my downflow o2 sensor AGAIN and after driving a bit over the past day I plugged in my code reader to check for any "pending" codes and sure enough, P0141 (downflow 02 sensor heater circuit malfunction) poped up, but no MIL light yet.
For those that don't know my recent woes... About 3 weeks ago I tried to go to Dodge and get my (very obviously dying) Cat converter replaced before my emissions warranty expires in about 5,000 km. Around the same time, I got code P0137 (downflow o2 sensor shorted to ground) so I replaced it with the recomended MOPAR ($$$) part. Less than 24 hrs later the MIL was back on, I got pissed and bought my own engine code reader, and picked up 2 codes: P0138 (Downflow o2 sensor above normal operating voltage) and P0141 (Downflow o2 sensor heater circuit malfunction). Ok, now I'm pissed... dealership finaly exchanged the o2 sensor since it MAY have been bad. So I replaced it again, cleared the codes drove like normal for the past day, and now got P0141 AGAIN, but pending, since no MIL light yet, but I know its only a matter of time before it comes on.
Anyone have ANY clue as to why this is happening? Or where I should begin since I highly doubt that its another "bad" 02 sensor. Feeling pretty stuck on this one... Thanks in advance guys.
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ticats
Dodge Dakota
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3/30/2004
20:19:40
| RE: Code p0138
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MaDgamEr ... what year, model and motor is your truck?
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MaDgamEr
Dodge Dakota
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3/30/2004
23:34:47
|  RE: Code p0138
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Sorry ticats, proud owner of a 5 speed '99 Dakota Sport 4x4 5.2L with approx 124,000 km.
Think you can shed some light on this? I'm thinking its either a "fluke" code that got thrown since it hasn't tripped the MIL (yet, lol) or that maybe the PCM itself (signal for o2 heater circuit) is junked.
I'm gonna test wiring continuity tomorrow between the upstream and downstream o2 sensor heater circuits (since its the same signal according to my Hayes manual) tomorrow after work. Maybe this will shed some light on the situation...
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Tony
Dodge Dakota
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12/19/2004
08:34:40
| RE: Code p0138
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Join,
Did you ever solve your problem?? I recently bought, Sept. 2004, a 1999 Dodge Dakota SLT 4x4 5.2L 110000 Km. The Mil light came on a short time later with the code reader showing Code P0138. My question is should I replace the O2 sensor and/or is the problem somewhere else??
My past experience with vehicles indicates that for most vehicle problems the problem and solution tends to be consistent for each model year.
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MaDgamEr
Dodge Dakota
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12/19/2004
23:37:10
| RE: Code p0138
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Tony,
I ended up replacing my POS dodge converter with an aftermarket piece from Magnaflow at my own expense shortly after posting here... As suspected, the original unit was in pieces and on the verge of creating more problems had one piece managed to flip sideways and block the exhaust. Codes still plague me from time to time (same 0138 and 0141 as before) but are a lot more rare now. I'm hesitant to replace the o2 sensor AGAIN and I'm witing until the spring to check the o2 wiring system in detail at that point. 0138 is downflow o2 sensor shorted high. 0141 is o2 heater malfunction. Hope this helps!
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Tony
Dodge Dakota
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12/21/2004
21:08:41
| RE: Code p0138
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Thanks for the Info
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Robert
Dodge Dakota
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11/17/2005
12:12:28
| RE: Code p0138
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If only the NOs are high, that points to the EGR valve. If stuck closed it can cause too much oxigen, and then the o2 sensors will add more fuel. and the CAT will get too hot and can kill the CAT (somewhat rare - blockage from getting too hot.)
P0138 High voltage is too rich or not enough O2 and can be caused by TPS, Map Censor, Canistor purge with too much fuel in it, Burning oil, leaking injectors, or too high presure in fuel rail.
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yvrdakota
Dodge Dakota
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11/27/2008
09:57:55
| RE: Code p0138
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Message:
if it's a 99 dakota i doubt you have a EGR valve, ive looked
everywhere for mine 99 3.9L
i have a 2000 dakota FSM
just google dakota FSM's and the link should show up, i think it
was pdftown???
i replaced my cat (up here in canada)
now i have a p0138 also hahaha
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