how do i know if my BMW injector needs replacing or just cleaning

If fault codes 2EFE, 29F1, or 30E0 return after a reset, or if cylinder balance corrections in ISTA show one cylinder consistently pulling more than 2 mg per stroke, the injector is failing internally and cleaning will not fix it. Replacement with a genuine OE unit is the only reliable fix at that point.

do I need to remap my BMW after replacing a fuel injector

No. These are direct OE-spec replacements — same part code as the dealer supplies — so the DME recognises them immediately with no adaptations required beyond a standard injector quantity coding, which takes about two minutes in ISTA or any compatible tool. No remap, no fuel table changes.

will a genuine BMW injector fix rough idle on my N55 or B48

In the majority of cases where the fault is confirmed as injector leak-down or poor spray pattern, yes. The units sold by mtriupgrade are pressure-tested and flow-matched before dispatch, which is what separates them from pattern-part copies that can fail within months on direct-injection engines.

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M-TRI UPGRADE

BMW OEM Fuel Injector - N20 / N54 / N55 / N63 / B38 / B48 (Per Unit)

Name: BMW OEM Fuel Injector - N20 / N54 / N55 / N63 / B38 / B48 (Per Unit)
Brand: M-TRI UPGRADE
SKU: MTRI-INJ-N20
Price: 219.0 USD
Availability: InStock

$219.00 USD

~~$275.00 USD~~ $219.00 USD

Sale Sold out

Shipping calculated at checkout.

Engine Code N20 N55 B38 / B48 N54 N63

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BMW OEM Fuel Injector for N20, N54, N55, N63, B38, B48, B58, S55, S58 engines. Genuine BMW replacement. Fixes rough idle, misfires, fuel smell. M-TRI UPGRADE, worldwide shipping.

Does any of this sound familiar?

Your BMW shakes at idle, especially when cold, and the feeling never fully goes away?
ISPA or ISTA pulled fault codes 2EFE, 29F1, or 30E0 and your dealer quoted you twice the part cost just to look at it?
You are getting rough, lumpy power delivery under load — not a tune problem, not a spark plug problem, the injectors are just worn?
Cold starts feel like the engine is running on five cylinders, and it takes a full minute to smooth out?
You replaced the coils and plugs already and the misfire came back — because nobody told you injector leak-down is the actual culprit on high-mileage N55s and B48s?
The dealer wants over $350 per injector for the exact same Bosch or Continental unit you can fit yourself in an afternoon?

BMW Original Equipment Fuel Injector — N20 / N54 / N55 / N63 / B38 / B48

Genuine BMW-spec fuel injectors, supplied per unit. Direct OE replacement — no remapping, no recoding. Solves rough idle, misfire codes (2EFE / 29F1 / 30E0), poor cold start, and uneven cylinder balance.

Why Genuine

OE part code — same supplier as the dealer (Bosch / Continental).
Drop-in — no programming or remap needed for replacement.
Pressure-tested & flow-matched — leakage and spray pattern verified.
Solves common faults — misfire under load, hard start, hesitation, fuel-trim faults.

Variant Options (per injector)

N20 — turbo I4 (228i, 320i, 328i, 428i, 528i, X1 28i, X3 28i). 4 injectors per engine.
N54 — twin-turbo I6 (335i, 535i, 740i, X6 35i, 1M, Z4 35is). 6 injectors.
N55 — turbo I6 (135i, 335i, 535i, 640i, 740i, X3 35i, X5 35i). 6 injectors.
N63 — twin-turbo V8 (550i, 650i, 750i, 760i, X5 50i, X6 50i). 8 injectors.
B38 / B48 — turbo I3 / I4 (F-chassis 18i/20i/30i, G-chassis 20i/30i). 3-4 injectors.

Specs

Brand: Bosch / Continental (BMW OE supplier)
Origin: Germany / EU
Sold per unit (not as a set)

Send your VIN to confirm exact part number and quantity required.

Frequently Asked Questions

How do I know if I need a new injector vs other fuel issues?

Common symptoms of a failed injector: misfire codes (P0301-P0306), rough idle especially on cold start, fuel smell from oil dipstick, sudden drop in MPG. A scan tool showing per-cylinder misfires is the clearest indicator. We recommend BMW dealer or independent diagnostic before replacing.

Are these genuine BMW injectors or aftermarket?

Genuine OEM Bosch injectors as supplied to BMW — same part numbers as factory replacement. Not aftermarket clones.

Do I need to code the new injector to my ECU?

Yes — direct injectors require flow rate calibration coding to the DME after replacement. We recommend BimmerCode or BMW dealer diagnostic. We can include remote coding service for an additional fee at checkout.

How many injectors should I replace at once?

Generally only the failed cylinder, but on high-mileage engines (>150,000 km) some shops recommend doing all 4 or 6 to avoid repeat labor. Your call based on age and driving habits.

What's the warranty on these injectors?

12-month warranty against manufacturing defect. Doesn't cover damage from contaminated fuel or unrelated engine issues.

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BMW OEM Fuel Injector - N20 / N54 / N55 / N63 / B38 / B48 (Per Unit)