How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Dodgerench Your Own Question

Dodgerench
Dodgerench, ASE Certified Technician
Category: Dodge
Satisfied Customers: 3110
Experience:  30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist
4486286
Type Your Dodge Question Here...
Dodgerench is online now
A new question is answered every 9 seconds

can u tell me what the codes po 107, po 133, and po 138 ...

Resolved Question:

can u tell me what the codes po 107, po 133, and po 138 many on my 1997 dodge ram 1500 5.2 4x4
Submitted: 6 years ago.
Category: Dodge
Expert:  Dodgerench replied 6 years ago.
Customer welcome to Just Answer!.

I've been trying to draw some sort of connection between these codes (sorry for the wait) but haven't come up with one yet. Let's take them one at a time... they may not be directly related.

P0107 (MAP SENSOR VOLTAGE LOW). This code can be set by a bad MAP sensor, a shorted signal circuit or software issues with the 1997 JTEC engine controller. I'd expect it to be a software problem, particularly if you operate the truck at higher altitudes.

Using engine braking to slow the truck (especially at altitudes over 7000 ft) can draw a very high engine vacuum. The MAP sensor had operating parameters established by engineering that were expected to be within a certain voltage range during normal operation. As so often happens, real life intruded. The cutpoint for determining P0107 was 0.2 volt in the original version. This was a voltage that could be obtained even in Metro Denver during a deceleration event when the engine reached its maximum volumetric pumping efficiency, right around 3000 rpm. Add in a dirty throttle body, which will cause a higher engine vacuum to be created and you can exceed that 0.2 volt parameter pretty easily.

A software flash was released that corrected the cutpoint to a more realistic 0.1 volt and the P0107 has been pretty much a non-issue since. You may need to have your PCM updated to take advantage of this feature. TSB 18-08-00 is the specific update for this code.

P0133 (UPSTREAM 02 SENSOR SLOW RESPONSE). It may be a sign of a worn oxygen sensor or it may be another update. Slow response means the sensor doesn't respond at the same rate as it should, with fewer half-cycles per unit of time measurement. The sensor is still working, it's just lost some of its youth. TSB 18-12-97 describes a similar code as this, but doesn't include the specific P-code (uses the engineering hex-code, which I don't have a cross reference for). It's described as UPSTREAM 02 SENSOR SLOW DURING CATALYST MONITOR. I'd recommend doing the flash update and see what happens. You may need a sensor, but may not.

P0138 (DOWNSTREAM 02 SENSOR SHORTED TO VOLTAGE). This normally means the DS02 has a failed electrical heater. When the sensor doesn't come up to operating temperature (600 degrees plus) the 5v diagnostic bias voltage supplied by the PCM sticks around and makes the sensor appear to be contaminated by another voltage source. The sensor will code if more than 1.2 volts are seen on the signal circuit and a cold sensor will be closer to 5.0 volts. Barring loss of power or ground to the sensor, it will simply be a worn-out downstream (after catalyst) oxygen sensor.

The flash updates I mentioned earlier both go in at the same time. When you update a controller, you always get the latest and greatest version. In this case it means several updates go in at the same time (up to seven). Besides the erroneous DTC corrections, there are cold engine driveability improvements and the potential for engine ping reduction. It's a manual-electronic adjustment that must be done with the factory scan tool for timing retard to reduce engine ping, so the tech needs to know whether you would like to try backing the timing down... it won't do it automatically. You have a choice of zero, 2 degrees or 4 degrees of timing retard. It will reduce engine output somewhat, so don't select any timing retard if you're not having a problem with engine ping.

That's about it. In a nutshell...

  • Flash the PCM with all available updates.
  • Clean the throttle body to restore minimum airflow. This is nothing more technical than cleaning the black rings you will see inside the throttle body bore and blades. Carb or throttle body cleaner works just fine for this.
  • (probably) Replace the downstream oxygen sensor.

Write back if you have any questions. I'd understand (lol)!

Thanks.

Ed

Dodgerench, ASE Certified Technician
Category: Dodge
Satisfied Customers: 3110
Experience: 30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist
Dodgerench and 14 other Dodge Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP. TOM WHITTAKER USA
< Last | Next >
  • I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP. TOM WHITTAKER USA
  • Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless! Rev. Jerry Baysinger Holts Summit, Mo
  • I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again. Greg Pittsburgh, PA
  • Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless! Jerry Holts Summit, MO
  • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
 
 
 

Meet The Experts:

 
 
 
  • Jerry

    Master Mechanic

    Satisfied Customers:

    1227
    ASE Master tech, 30 years exp. troubleshooter, driveability tech
< Last | Next >
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1227
    ASE Master tech, 30 years exp. troubleshooter, driveability tech
  • http://ww2.justanswer.com/uploads/MO/MoparCertified/2012-6-7_4142_mechanic.64x64.jpg Mopar Certified's Avatar

    Mopar Certified

    Dodge Technician

    Satisfied Customers:

    5813
    24 Year Chrysler/Dodge Certified Specialist
  • http://ww2.justanswer.com/uploads/jeep10000/2008-9-18_222938_192601.jpg Chris's Avatar

    Chris

    Shop Foreman

    Satisfied Customers:

    4041
    ASE and Chrysler Certified Master Tech
  • http://ww2.justanswer.com/uploads/ke4ich/2009-08-12_212931_DSC02211.JPG moparfl's Avatar

    moparfl

    ASE Certified Technician

    Satisfied Customers:

    3285
    ASE Master Tech Gold level Chrysler Status 30 years dealership exp
  • http://ww2.justanswer.com/uploads/DO/dodgerench/2012-8-1_1142_IMG3173.64x64.JPG Dodgerench's Avatar

    Dodgerench

    ASE Certified Technician

    Satisfied Customers:

    2480
    30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Dodge Mechanic

    Satisfied Customers:

    1870
    30 years experience in Dodge Chrysler and Plymouth
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    1664
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL