P0087 on Mazda
Fuel Rail/System Pressure - Too Low
P0087 on Mazda vehicles indicates fuel rail/system pressure - too low. Au7o has documented this code across 4 Mazda models — most commonly on CX-5, CX-90, Mazda3. This code means the fuel rail or fuel system pressure has dropped below the level the engine's computer expects. The computer monitors a fuel pressure sensor and has seen pressure fall too low, meaning the engine isn't getting enough fuel — especially noticeable under acceleration or load. This is most common on direct-injection and diesel systems that run very high pressures. Symptoms include hard starting, stalling, hesitation, lack of power, and possible limp mode.
Common Causes of P0087
- •Clogged or dirty fuel filter
- •Weak or failing fuel pump (lift pump or high-pressure pump)
- •Faulty fuel pressure regulator or control valve
- •Restricted or leaking fuel lines
- •Faulty fuel pressure sensor
- •Air in the fuel system or running low on fuel
- •Worn high-pressure pump (direct injection/diesel)
P0087 on Mazda by Model
Mazda CX-5(1 issue)
- Defective Fuel Pump (Denso Recall)2019-2021
Low-pressure fuel pump impellers can deform, causing pump failure and engine stalling without warning. Part of massive global recall affecting 19+ million vehicles across multiple manufacturers.
Mazda CX-90(1 issue)
- Engine Stalling / Loss of Power (Recall Related)2024-2025
The CX-90 has been subject to multiple recalls for engine stalling. Issues include fuel pump control module software errors, turbocharger boost control faults, and engine control module (ECM) programming that can cause unexpected engine shutdown. NHTSA campaigns 24V-014 and 24V-228 address these issues. Engine stalling while driving presents a serious safety risk.
Mazda Mazda3(1 issue)
- 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875)2018
The in-tank low-pressure fuel pump supplied by Denso used an impeller molded with too low a density; it absorbs fuel, swells, cracks and deforms, then binds against the pump housing. Fuel delivery drops off, the engine runs lean, hesitates and can stall outright - sometimes at speed - and often will not restart when hot. This is the same defective Denso pump batch that hit millions of vehicles across several brands. Mazda's campaign covering 2018 Mazda3 and other models is NHTSA 21V875000, roughly 121,000 vehicles, with owner letters mailed July 2022. Owners report a long crank, a rough idle and low fuel rail pressure codes before the pump quits entirely.
Mazda Mazdaspeed6(1 issue)
- High-Pressure Fuel Pump (HPFP) Cannot Hold Pressure Under Load2006-2007
The mechanical HPFP is driven off an intake cam lobe and is famous for not maintaining the stock ~1600 psi rail pressure at high load, with pressure dropping under acceleration. Internal wear of the piston, sleeve and cam bucket, or a sticking spill valve / stuck pressure-relief valve, causes intermittent pressure fluctuations. The lean condition from dropping fuel pressure produces bogging and hesitation and, on tuned cars, can be dangerous to the engine.
Looking for P0087 on a different make?
View P0087 across all makes →Frequently Asked Questions
What does P0087 mean on Mazda?▼
P0087 stands for "Fuel Rail/System Pressure - Too Low." This code means the fuel rail or fuel system pressure has dropped below the level the engine's computer expects. The computer monitors a fuel pressure sensor and has seen pressure fall too low, meaning the engine isn't getting enough fuel — especially noticeable under acceleration or load. This is most common on direct-injection and diesel systems that run very high pressures. Symptoms include hard starting, stalling, hesitation, lack of power, and possible limp mode. On Mazda specifically, this code is documented across 4 models.
What causes P0087 on Mazda vehicles?▼
Common causes on Mazda: Clogged or dirty fuel filter, Weak or failing fuel pump (lift pump or high-pressure pump), Faulty fuel pressure regulator or control valve, Restricted or leaking fuel lines, Faulty fuel pressure sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0087 on a Mazda?▼
Repair costs vary widely depending on the root cause and specific Mazda model.
Which Mazda models have P0087 documented?▼
Au7o has documented P0087 on 4 Mazda models: CX-5, CX-90, Mazda3, Mazdaspeed6.