Audi P0087

Fuel rail pressure too low on Audi diesel — HP pump wear or in-tank lift pump on 2.0/3.0 TDI common rail.

Audi P0087 — Fuel rail pressure too low on Audi diesel — HP pump wear or in-tank lift pump on 2.0/3.0 TDI common rail. Typical UK independent garage cost: £180–£1800.

What actually causes P0087 on a Audi

Audi 2.0 TDI CR P0087 is often the in-tank lift pump going lazy before the HP pump itself fails. On 3.0 TDI V6 it's frequently a torn fuel-line quick-connector under the tank. Always rule out cheap causes before condemning the HP pump (£900+).

Audi engines that log P0087

• 2.0 TDI CR (A4/A6 CFFB/CGLC)
• 3.0 TDI V6 CR (A6/Q5/Q7 CDYA/CDYC)
• 2.7 TDI V6 CR

How we diagnose P0087 on a Audi

1. Read rail pressure target vs actual under load
2. Test in-tank lift pump pressure at the supply line
3. Inspect fuel filter and quick-connectors for leaks
4. Check for metal contamination in fuel filter — sign of dying HP pump
5. Only condemn HP pump after confirming healthy supply pressure

The common misdiagnosis to avoid

Garages skip straight to HP pump on P0087 — a £140 lift pump or £45 fuel-line connector fixes 60% of these. Test lift pressure first.

Audi P0087 repair cost in the UK

Expect £180–£1800 including parts and labour at an independent garage. Main-dealer quotes on Audi are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.

Bob's workshop tip

Audi 2.0 TDI P0087 in cold weather only — wax in cheap supermarket diesel. Drain, fresh premium, additive. Free fix.

Codes usually seen alongside P0087 on Audi

• P0088
• P0089
• P0090

Symptoms drivers report with P0087

• Sudden loss of power on the motorway — car drops into limp mode at exactly 2,500 RPM
• Restarts fine after a key-cycle, then relimps under load 20 minutes later
• Hard cold-starting: cranks for 4–6 seconds before catching
• Uneven idle with a diesel-knock 'nail' from cold
• MPG drops 3–7 mpg before the light even comes on
• Metal glitter in the fuel filter housing = CP4 pump has already grenaded

Repairs that clear P0087

• Change the fuel filter and retest
• Measure injector back-leakage into a graduated tube
• Test rail pressure against commanded on live data
• Replace the pressure regulator or metering valve

For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0087 guide.

Reading P0087 on a Audi properly

A generic reader will show P0087 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Audi has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.

Clearing P0087 without fixing it

Erasing the code resets the Audi's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.

Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0087 is showing on your Audi, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.