2002 Pathfinder shaking at 5-25 mph

[coloradoride]

Hello Everyone, I'm new to the post and can use some help. My 2002 4x4 Pathy has the shakes at speeds between 5-25 mph. I took it to the dealer and they said it needed a new passenger side rear bank O2 sensor & an ECU reset. They wanted $600 so I paid the $120 diagnostic fee and replaced the O2 sensor and reset the ECU myself this morning. Unfortunately I still have the shaking. I did a test and turned off the engine and drifted and the shaking stopped so I'm positive it's not the wheel balance or u-joint related. I'm so frustrated with the dealer and fear they'll ask for another $120 to diagnose the issue. Anyone have any ideas what the shaking could be related too? I look forward to hearing from those with more experience.

[Towncivilian]

Welcome to NICO.

The rear oxygen sensors have absolutely zero impact on the operation and driveability of our vehicles. I think they just wanted your money.

Does it shake in both 2WD and 4WD? Check the rear trailing arm bushings - they may be worn.

[coloradoride]

Hello Towncivilian,

thanks for the welcome and response to my request. It shakes in both 2 & 4 WD. I will check out the rear trailing arms tomorrow. I also plan to call the dealership to see how they respond to their error in diagnosing the issue. I am so glad I didn't give them the $600 to later find out it didn't solve the problem.

[NismoPick]

I took it to the dealer and they said it needed a new passenger side rear bank O2 sensor & an ECU reset.

Is / was your Check Engine Light on? If so, what are the diagnostic codes?

[coloradoride]

Hi NismoPick,

No check engine lights came on. I plan to take the truck to an independent shop today. I hope they will be able to determine the issue. I'll keep everyone posted on their diagnosis.

Thanks, George

[coloradoride]

Hello all,

for all those who are following this issue, the independent shop has indicated that the front drive line u joint is bad. He recommended that I replace both u joints since I have 133K on the truck. It will cost about $300 which is well spent money in my opinion considering the dealer completely missed this for $120. Hopefully this can help someone in the future.

Thanks for everyone's help solving this mystery.

[NismoPick]

I'd go back to the dealer and raise hell with the service advisor / manager. A complete misdiagnosis is not acceptable for a dealer.