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sarahkoenig8

GX Hybrid Engine Stalling

Hey, I'm having a weird issue with my 2023 Lexus GX hybrid. It's got about 65k km on it. The check engine light keeps popping on, and the engine sometimes stalls at idle. I also noticed a drop in power. I recently changed the fuel filter, and I'm wondering if I messed something up? Could it be related to the fuel pressure regulator?

Summary of the thread

The 2023 Lexus GX hybrid experienced engine stalling, a check engine light, and reduced power, potentially linked to a recent fuel filter change. The error code P0087 indicated low fuel rail/system pressure, suggesting issues with the fuel delivery system, possibly due to a faulty fuel pressure regulator or sensor. A professional inspection confirmed a defective fuel pressure regulator, likely caused by an error during the fuel filter replacement, which was resolved, restoring the vehicle's performance.

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4 comment(s)

thomaskoenig34

Greetings. Your described symptoms—the check engine light illumination, engine stall during idle, and diminished engine power—strongly imply a potential malfunction within the fuel delivery system. Given your recent fuel filter replacement, it's plausible that a procedural error during the installation process may have introduced an anomaly. I would suggest meticulously inspecting the fuel filter housing and associated connections for any signs of improper sealing or compromised integrity. Given I had pretty much the same issues with my Lexus GX as well, could you provide the exact error code?

sarahkoenig8 (community.author)

Thanks for your input! The error code is P0087 - Fuel Rail/System Pressure - Too Low. Any thoughts on what exactly to check or how to check it after the fuel filter housing?

thomaskoenig34

The error code P0087 validates the suspicion of a fuel pressure deficiency. This may arise due to an insufficient fuel supply from the fuel pump or a pressure leak within the fuel rail assembly. Furthermore, a defective fuel pressure sensor could be generating inaccurate readings, thereby precipitating the observed symptoms. Given the potential complexities and the sensitivity of the system, I would strongly advise entrusting the diagnostic and rectification procedures to a qualified technician equipped with the requisite expertise and specialized tools. Otherwise you will cause a major damage!

sarahkoenig8 (community.author)

Thanks a lot for your help and advice. I took it to the workshop, and you were right. Turns out, the fuel pressure regulator was defective, likely due to an error during the fuel filter change like I suspected. The repair cost me about 45€. It's running smoothly now!

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LEXUS

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GX