Hey everyone,

I’ve got a 2015 Honda Fit that I bought in 2015 with just 3k miles, and it’s now sitting at around 170k. Last month, it started leaking oil pretty badly, and it turns out the timing chain had worn through the timing cover. I found a local guy selling an engine listed as a 2015 on eBay and decided to pay him cash to install it, thinking it’d be quicker than repairing the chain and cover myself.

After picking up the car, I immediately got error codes P0087 (fuel rail/system pressure too low) and P0088 (pressure too high). Upon inspecting further, I discovered he had actually installed an engine from a 2018 Fit, and from my research, I found out that the 2018 uses a different fuel pump. I ordered the correct 2018 fuel pump and installed it, which cleared the P0088 code, but I’m still getting the P0087 after a few minutes of driving.

I’m pretty mechanical and honestly should’ve just replaced the timing cover and chain myself, but I thought a low-mile engine (8k miles) for $1,700 installed would save me time. Now I’m at a loss. I’m thinking the next step might be replacing the fuel pressure sensor on the rail, but I’m having trouble finding the correct part number.

Does anyone have any insight into what might have changed between the 2015 and 2018 engines that could be causing the fuel pressure errors? Any advice on how to proceed would be greatly appreciated!

Thanks in advance!

 

Attached is a video showing the fuel pressure drop at the 1:02 mark. The pressure on my diagnostic tool starts around 9000 kPa, but suddenly drops to 210 kPa and never recovers. If I turn the car off and back on, or disconnect and reconnect the sensor, the pressure goes back to the thousands making me think it is a sensor issue.

 

Update. Still no luck but it appears the computer is cutting off the high-pressure fuel pump as I can audibly hear it click and am getting the same results by disconnecting the hpfp connector when the pressure drops.

 

Update: I removed the fuel pressure sensor from the rail and cleaned it with a Q-tip and ether. After cleaning, the HPFP (High-Pressure Fuel Pump) didn’t shut off for about 50 miles, even with multiple stops and starts. I then ordered a new pressure sensor (part #499000-8450) from Amazon and installed it. I cannot make out the D number underneath and am not sure if this affects anything. However, after installation, I got the following codes: P0088, P0087, P0193, and P2623. I cleared the codes and took the car for a test drive, but within less than a mile, the HPFP shut off again, and the car went into limp mode returning the same 4 codes.

I removed the new sensor, reinstalled the old one, cleared the codes, and am currently testing again. So far, I’ve driven about 15 miles with no codes returning. I should note that I’m keeping the car under 3-4k RPM—if I go over, the HPFP shuts off again, and the car goes back into limp mode.