I just bought a 2015 LR4 with 70k miles, and after driving it for a month the “check engine” light came on. Advanced Auto let me use their scanner and I got the attached output (see images) P0089 Fuel Pressure Regulator.

Advanced Auto recommended YouTubing it and I didn’t find much. The parts are only $35/pc, but I’m concerned that I might screw something up. I’ve got a long (850 mile one way) drive coming up soon and don’t want to have any problems.

Any input here would be appreciated
Thx
Bret

 

The code is simply saying there is a fuel pressure issue, not that the regulator itself is at fault. So it could easily be a fuel pump issue.

 

Thanks for the quick response. Any thoughts on the ease of solving the problem? I'm not feeling reduction in performance or seeing a drop off in gas mileage either in town or on the highway. Hate the notion of bringing it to the dealer if it's an ease fix that I can do on my own.

 

It could be an easy fix, but the devil is in the details or in this case the diagnosis.

No good indy shops around?

 

Thanks for the feedback. Just spoke with a local independent shop that has experience with LR4s. His thought is that it might be the pump surging (over the pressure limit), since I haven't seen any loss of power. Or possibly a bad sensor. Taking it in next week to get it looked at.

 

Your vehicle has a main electrical pump and then 2 mechanical high pressure pumps. I find that the mechanical pumps have issues more often than not. Good luck and report back what you find.

 

I have finally had my 2015 LR4 repaired for the exact same code you show on your first post. I have a generic code reader and it showed the P0089 code with know explanation. I took the vehicle to an auto parts store and it showed exactly what you had on your first post High Pressure regulator bank 1. After looking under the hood and from under the vehicle I couldn't find access to the high pressure sensor I decided to take it to my local independent rover repairman. He scanned it with a typical dealer program and found the code P0089-64 Fuel Pressure Regulator 1 Performance - Signal plausibility failure. It showed it as 100%. He installed a new High Pressure fuel sensor and it didn't clear the fault. He ended up installing the low pressure fuel sensor also and that cleared the fault. His next step would have been to install a new fuel pump.
I asked to see how they found the High Pressure sensor and found they removed the main battery and battery holder. The fuel rail and sensor are very accessible at this point. This would also give you good access to the no. 3 spark plug. I understand the low pressure sensor is under a heat shield on the right side of the transmission.
This has been the second time I have had to have this repaired, once under warranty. If it happens again I will attempt to repair it on my own knowing how to gain access.
Please keep us posted on what you find on your vehicle.

 

UPDATE: I took the vehicle to a local Indi repair shop and they used a more advanced code reader and found the issue to be tied to the "Oxygen Sensor-Downstream Right". Total cost to replace the sensor and clear the codes was $295.86. No apparent problem with the fuel pressure sensor.

The Tech, who was with the local LR dealer for ~8 years said that the P089 code was driven somehow by the oxygen sensor code being tripped. He described it (or maybe better said that I understood it), as the codes can cascade from one to another and the less sophisticated readers aren't able to capture the true cause of the check engine light coming on.

Regardless, the lights are off, the truck runs great and all is good. I'll report back if anything new pops up.

 

Odd. And that is either one expensive O2 sensor OR an affordable headache solver. Glad all is well.

 

have you had any issue since then? I have the same exact code P0089-64 and i might need to replace the high pressure fuel pump. I might suggest them to change the sensor you were talking about, before spending $1200