P0107 - P0132 - P0135 - P0141 - P0138 - 1996 Dodge Dakota

I just bought a 96 Dodge Dakota V6 3.9litre

It failed emissions with these codes:
P0107 - P0132 - P0135 - P0141 - P0138

Could there be a single cause for all of these codes? I am assuming they refer to two O2 sensors and the MAP sensor. The truck runs and idles great so I am not sure how they are affecting performance. I just need to pass emissions. Of course, fixing the problem would be nice too.

I have seen previous posts and will check the fuses. Not sure how to check vacuum leaks (not sure where the vacuum lines are) but I just got a Haynes manual. The air filter was very dirty. Maybe changing it will help?

Any advice would be greatly appreciated.

Thanks.

Matt,


FIRST: On the codes, did YOU use a SCAN tool or did a repair shop???

SECOND: If a shop use a scan tool, they a required by LAW to give you a printout and a discription/breakdown of each problem. IF you used your own scan tool(depending on model) that tool should give you a good picture of where to look!!

THIRD: On the matter of them being a single problem, YES they can, BUT not alway the case.

FOURTH: On the matter of affecting PERFORMANCE, any time the CK ENG. light comes ON, one way or another it is affecting the vehicle FUEL mileage/performance..

FIFTH: VERY GOOD idea on changing that dirty air filter, that was robbing you of some serious fuel mileage & performance and at the price of gas these days!!

IF you have a scan tool, and you say the TRUCK ran GREAT before the codes appeared, then CLEAR the codes, run the truck and see if the SAME EXACT codes reappear, if they do, repair accordingly!!

On the issue of checking for LEAKS, have the truck idling, have a can of carb. cleaner in hand, spray LIGHTLY around the areas that mite have a problem ie; vacuum lines, intake area, EGR area, you get the picture, WATCH/LISTEN to ANY changes to the engines idle; IF the idle DROPS you found the leak!!

KEEP in mind these are JUST suggestions/areas to look at from other people that I have talked too..

Hope this helps and good luck!!!

mmmsmith

Thanks for the reply.

I bought a SCAN tool today and got the same codes that the emission testing place gave me. The first code is for the MAP sensor and the others are for O2 sensors and seem to be shorts or some sort of electrical problem.

But, I cleared the codes and now the after driving a few miles I get a pending P0138 which is an O2 code. Also, now the truck has started driving a little slugishly. It does not stall but seems to have difficulty getting going.

I did replace the air filter and now I have noticed that there is no suction on the PCV valve so I will change that tomorrow. Maybe the fuel filter needs changing too. I guess since the O2 sensor code came back I should replace the two O2 sensors as well. I just don't want to replace parts and not the problem.

MATT

Was/is this truck USED?? If so, did you purchase it from a private party or a USED car dealer?? Either way "BOTH" are to ensure the vehicle will pass a "SMOG" before any transaction!! If they didn't, "THEY MAY" be held responsible/liable for damages.. NOTE: In order to transfer a title of any vehicle, the vehicle MUST first PASS a SMOG test(depending on the state).

Matt, has this truck been maintained ie; TUNE-UP, OIL CHANGES, WIRES & PLUGS, FUEL FILTER, TRANS. FLUID & FILTER etc... on a regular basis?? IF NOT, spend the money and start FRESH my man.. This way YOU know that everything is NEW and you will have a better peice of mind!!

I found that by replacing parts BEFORE there needed, helps in the LONG run, that way I have less to worry about...

Just to give you an EXAMPLE, one of my vehicles has just over 64k and it's a 93 car, the only major repairs were intake manifold gasket (not covered) & a starter(covered under a Warranty)... AT 50k I replaced everything, you name it, it got replaced.. It took me two days of my time to do all the repairs & about $100.00 for parts and the car still PUUURRRSS!!

Hope this helps you with whatever you decide on doing!!!

GOOD LUCK!!! C

I think you've got a wiring problem to the 0xygen sensor circuit(s) and maybe a plugged converter. The Map sesnor could cause some 02 codes if it's throwing the fuel mixture out but you have to check it's circuit and the tps circuit before throwing parts at it. Check the intake manifold gaskets for a vaccum leak as well. I've fixed alot of those dakota's at the dealer

good luck and keep us postted

Jeff

Thanks Jeff.

Before I read your post I decided to install new sparkplugs, PCV valve, and both O2 sensors. A couple of minutes after cranking the engine my SCAN tool read two codes for O2 sensor circuit high voltage for both O2 sensors. You must be right that there is a circuit problem somewhere. I checked the intake for vacuum leaks and it seems to be OK. I also checked the MAP sensor and TPS circuits and they are passing voltage. I will check the O2 circuit tomorrow. I was studying the Haynes manual wiring diagram and will try to test from the PCM? I am not even sure where the PCM is. Any ideas?

Thanks again

Oh yeah, what converter may be plugged?

OK, I realized that converter means catalytic converter, whoops.

Well, I think I fixed the problem. After doing what I said I wouldn't by replacing parts first, I found out that there was a discontinuous wire where it splits from the main PCM wiring to the upstream and downstream sensor. It looked like it was just a heater wire (green with red stripe) and it was the only one that measured no continuity.

So far, after driving the truck for about ten miles, I have not read the codes again. Of course, the PCM isn't yet ready for the sensor, heater, and catalytic converter. Not sure how much driving it takes to make these ready but it looks fixed.

Thanks for the tips. I wouldn't have thought it was a wiring problem.