P0087 on Mazda: How to Diagnose & Fix
Fuel Rail/System Pressure - Too Low
3 Mazda models · 3 documented issues · 2 critical
P0087 on Mazda by model: symptoms, diagnosis and fix
Low-pressure fuel pump impellers can deform, causing pump failure and engine stalling without warning. Part of a Denso low-pressure fuel pump defect that led to recalls by multiple manufacturers.
Common Symptoms
- Engine no-start condition
- Vehicle stalling at low speeds
- Sudden engine stall at highway speeds (rare but dangerous)
- Loss of power while driving
How to Fix
Dealer replaces fuel pump free of charge under recall. Contact Mazda dealer with VIN to check recall status.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Owner tips & cautions
- TipCheck recall status immediately at Mazda dealer
- TipSchedule repair ASAP - safety risk
- TipKeep fuel tank above 1/2 to reduce pump stress until fixed
- TipDocument any stalling incidents for dealer
Sources for this issue (2)
The CX-90 has been subject to multiple recalls for engine stalling and loss of drive power. Under Recall 7024J (NHTSA 24V815), improper software in the powertrain control module (PCM) and engine control modules (ECM) can illuminate malfunction indicator lights and activate a fail-safe mode that limits drive power; related campaigns cover engine no-restart after i-stop (24V816), PHEV loss of power in EV mode (24V817) and fuel-gauge-related running out of fuel and stalling (25V568). Engine stalling while driving presents a serious safety risk.
Common Symptoms
- Engine stalls unexpectedly while driving
- Loss of power followed by engine shutdown
- Check engine light and multiple warning indicators
- Engine fails to restart immediately after stalling
- Reduced power mode / limp mode activation
How to Fix
Take vehicle to Mazda dealer for recall service. Recall 24V815 involves PCM and ECM reprogramming with improved software (resolving DTC P061B); no fuel pump or turbocharger hardware is replaced. Service is free under recall. Check NHTSA recall lookup with VIN to verify applicability.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Owner tips & cautions
- TipCheck NHTSA.gov recall lookup with your VIN - multiple recalls may apply
- TipSchedule dealer appointment promptly - engine stalling is a safety issue
- TipAll recall repairs are free of charge at any Mazda dealer
- TipIf stalling occurs before recall service, pull to safe location and call roadside assistance (800-222-5500)
Sources for this issue (3)
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.
Common Symptoms
- Bogging or hesitation under hard acceleration
- Fuel pressure dropping below spec under load
- Stumble/misfire feel at high RPM or high boost
How to Fix
Diagnose by logging fuel pressure under load with an Accessport or fuel-pressure gauge to confirm the pump can't hold spec. Worn internals are rebuilt with upgraded internal kits; stuck spill/relief valves or a bad housing check valve are replaced. Keeping the engine in good tune and not over-demanding fuel from the stock pump extends its life.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- CorkSport Mazdaspeed high-flow fuel-pump internalsOEMCorkSport Mazdaspeed HPFP internals
Performance/high-demand or confirmed pumping-element branch after low- and high-side fuel diagnosis Fitment/availability: The current direct manufacturer page identifies the high-flow internals for 2006-2007 Mazdaspeed6, 2007-2013 Mazdas…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
P0087 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0087 mean on a 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 it is documented across 3 models: CX-5, CX-90, Mazdaspeed6.
What are the most common causes of P0087?
The most common causes of P0087 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0087 on a Mazda?
Repair costs vary widely with the root cause and Mazda model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.