Editing Openai/69606181-ab0c-8001-96cc-1653bd658833 (section)

=== Assistant: Got it — 2014 Audi Q5 2.0T EA888, direct injection. ===
Got it — 2014 Audi Q5 2.0T (EA888, direct injection).
For this specific platform, P0087 has a very clear “greatest hits” list, and we can narrow it down fast.

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==== The ECU is seeing fuel rail pressure drop below target, usually under acceleration or load. ====
On this engine, that almost always points to a supply-side issue, not injectors.

==== ### ====

This is the #1 known failure on EA888 engines.
* The HPFP is driven by a cam follower
* When the follower wears: - Pump stroke shortens - Rail pressure drops - ECU throws P0087
* Often happens without noise
* Can cause camshaft damage if ignored

Classic signs
* Loss of power on highway on-ramps
* Hesitation above ~3k RPM
* Code appears only under load

⚠️ If the cam follower hasn’t been inspected/replaced, this should be priority #1

===== Audi uses a filter + pressure regulator assembly. =====
* Clogs over time
* Starves HPFP
* Very common if filter is original

Interval reality
* Audi says “lifetime”
* Reality: 60–80k miles max

Cheap fix compared to pumps.

===== - Supplies fuel to the HPFP =====
* Weak pump = HPFP can’t keep up
* Often shows: - Long crank - Pressure drops under load - Sometimes paired with P310B

===== - Usually sets implausible signal codes =====
* Flatlined or erratic readings
* Not the first thing to replace

===== - Pump control module =====
* Ground under rear seat
* Relay fatigue

==== ### ====

Look at:
* Specified rail pressure
* Actual rail pressure
* Compare at: - Idle - Steady cruise - Hard acceleration

If actual falls behind target → mechanical issue.

===== This is fast and decisive. =====
* Remove HPFP (top of engine)
* Inspect follower: - Flat = OK - Dished or punched = problem
* If worn: - Replace follower - Inspect cam lobe - HPFP may also need replacement

===== If you don’t know when it was last done → replace it. =====

===== - Verify pressure at idle and load =====
* If low side can’t maintain pressure → pump or module

==== Continuing to drive with P0087 on this engine can: ====
* Score the intake cam
* Destroy the HPFP
* Lead to $3–5k repair instead of $150–600

This is one of those “small fix now vs big fix later” Audi problems.

==== 1️⃣ Mileage ====
2️⃣ Does it happen only under acceleration or also at idle?
3️⃣ Any other codes (especially P310B, P2293, P0089)
4️⃣ Original fuel pump / filter?

Once I have that, I’ll tell you exactly what to replace first — no parts cannon.