Keihin 16450-RBB-003 · Serviced & Flow-Tested

Honda Civic Si K20 / Acura RSX / TSX Fuel Injector Cleaning & Flow Testing

The Keihin 16450-RBB-003 is a MPFI (port injection) fuel injector used in Honda Civic Si K20Z3 (2006-2011), Acura TSX 2.4L (2004-2008), Acura RSX K20A2/K20A3, Acura CSX, Honda Accord/CR-V K-series; 8-hole nozzle, V spray pattern. We ultrasonic-clean and flow-test injectors like this one in our shop, then send back before-and-after data so you know exactly what you're getting.

Manufacturer	Keihin
Part number	16450-RBB-003
Type	MPFI (port injection)
Connector	Honda OBD2 / Keihin V (EV6 standard size)
Published flow	320 cc/min @ 3 bar
Published impedance	12 Ω

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Our measured results

These are the actual before-and-after numbers from our flow bench for the Keihin 16450-RBB-003 — not published estimates.

Tested in our shop	4 injector(s) @ 40.0 psi
Measured coil (avg)	10.45 Ω
10s open flow (avg)	54.5 → 55.5 ml (+1.8%)
60s pulsed flow (avg)	54.0 → 54.75 ml
Leak test after cleaning	4/4 PASS

Also known as / cross-references

The Keihin 16450-RBB-003 is interchangeable with or cross-references to these part numbers:

12294 (Keihin internal)842-12294

What vehicles use the Keihin 16450-RBB-003?

Honda Civic Si K20Z3 (2006-2011), Acura TSX 2.4L (2004-2008), Acura RSX K20A2/K20A3, Acura CSX, Honda Accord/CR-V K-series; 8-hole nozzle, V spray pattern

How we service it

Every injector gets ultrasonic cleaning, backflushing, before-and-after flow testing (static and dynamic), leak testing, spray-pattern inspection, and new O-rings and micro-filter baskets where available — plus a detailed Injector Performance Report. Round-trip USPS shipping is $15 flat.

Frequently asked questions

What vehicles use the Keihin 16450-RBB-003 injector?

The Keihin 16450-RBB-003 is used in Honda Civic Si K20Z3 (2006-2011), Acura TSX 2.4L (2004-2008), Acura RSX K20A2/K20A3, Acura CSX, Honda Accord/CR-V K-series; 8-hole nozzle, V spray pattern.

Can you clean and test a 16450-RBB-003 injector?

Yes. We ultrasonic-clean, backflush, and flow-test the Keihin 16450-RBB-003 on our bench, including before-and-after open and pulsed flow, leak testing, and spray-pattern inspection, with new O-rings where available.

What did the 16450-RBB-003 flow at?

On our bench, 4 16450-RBB-003 injectors averaged 54.5 ml open flow before cleaning and 55.5 ml after, tested at 40.0 psi.

How much does it cost?

Standard MPFI top-feed injectors are $30 each; side-feed, GDI, TBI and specialty injectors are $35 each. Round-trip shipping is $15 flat, 4-injector minimum.

How do I send them in?

Start an order on our Get Started page, ship your injectors to our Weymouth, MA shop, and we return them cleaned, tested, and documented.

Send in your 16450-RBB-003 injectors

Mail-in cleaning and flow testing with a full before/after report. 4-injector minimum, $15 flat round-trip shipping.

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