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Code p0171 and p0172. P0172 fuel system 1/1. P0171 fuel

Customer Question
Code p0171 and p0172 ...

Code p0171 and p0172

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

P0172 fuel system 1/1 rich

Mechanic's Assistant: What is the model/year of your Jeep?

P0171 fuel system 1\1 lean

Mechanic's Assistant: What year is your Jeep?

07 jeep commander 3.0

Mechanic's Assistant: Are you fixing your Commander yourself? What have you tried so far?

Yes repairing myself. Replaced the o2 sensors and cleared the codes. codes came back after running for just a min.

Submitted: 7 months ago.Category: Jeep
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Customer reply replied 7 months ago
3.7 not 3.0
Customer reply replied 7 months ago
checked fuel pressure and is at 60 psi
Answered in 15 minutes by:
12/21/2017
Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago
Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 28,150
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

How does the engine run? Does it idle rough? Does it stall out? Does it have plenty of power under a load?

Is this your vehicle or are you working on this vehicle for a friend or customer?

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Customer reply replied 7 months ago
engine runs and idles fine. no stalling issue. is low on power. friends jeep.
Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

Thank you for that information.

What is the engine vacuum at when the engine is at idle?

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Customer reply replied 7 months ago
map vac is at 13.03
Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

What about using a hand held vacuum gauge?

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Customer reply replied 7 months ago
manual gauge shows 14
Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

YIKES! That's low! That is the problem. The engine vacuum is WAY TOO low affecting the fuel system/fuel trims.

Based on my experience, low engine vacuum is caused by one of a few things..

  • Air/vacuum leaks
  • Plugged exhaust
  • Incorrect valve timing (timing chain lose or jumped time)
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Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

I hope this helps! Keep in mind this is a "starting point". My goal is to give you the best experience possible! I hope I have earned a 5-star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

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Jeep Mechanic: Amedee, Jeep Technician replied 6 months ago

Hello there!

I am just checking in to see how things are going and to see if you need any further assistance?

If so, please let me know as I will be happy to help.

Best Regards,

Customer/p>

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