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vipertech, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1854
Experience:  Jeep factory certified technican
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04 Jeep Grand Cherokee Laredo with dtc P0135, and P0155, I

Resolved Question:

04 Jeep Grand Cherokee Laredo with dtc P0135, and P0155, I have changed the 02 sensors(oe replacement) 4 times the code keeps returning, any ideas? What about reflashing the computer? Also the MUX code? any ideas?
Submitted: 6 years ago.
Category: Jeep
Expert:  vipertech replied 6 years ago.

Good evening.....the code p0135 has a related service bulletin. The recommendation is to perform a software update on the PCM. Here is a copy of the bulletin:




As far as P0155....the bulletin applies to this as well. It covers 4 possible codes found. You have 2 of those. So I highly recommend having the software updated.



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