The 2002–2003 Acura RSX has several identification numbers, and knowing where to find them can help when verifying an engine, identifying a transmission, checking a replacement drivetrain, or inspecting a used RSX.
Honda’s factory service manual identifies separate locations for the vehicle identification number (VIN), engine number and transmission number.
For an aging performance car like the DC5, that’s more useful than it might sound. Twenty-plus years of engine swaps, transmission swaps and creative Craigslist archaeology mean the badge on the hatch doesn’t always tell the entire story.
Where Is the VIN on an Acura RSX?
The factory service manual shows the RSX vehicle identification number in the normal vehicle-identification locations and separately identifies the drivetrain serial-number locations.
For 2002 models, the VIN structure begins with an example such as:
JH4 DC538*2 C 000001
The manual identifies JH4 as Honda Motor Co., Ltd. and the vehicle as an Acura passenger vehicle. It identifies DC5 as the Acura RSX line associated with the K20A2 and K20A3 engines.
The VIN therefore tells you considerably more than simply which car you’re looking at.
Can the RSX VIN Tell You the Model Year?
Yes.
According to the factory manual, the model-year position uses:
2 = 2002
For the following model year:
3 = 2003
The manual also identifies factory code C as Honda’s Saitama/Sayama factory in Japan.
That’s particularly useful when you’re dealing with a car containing parts from multiple model years.
How Can You Identify an RSX Type-S From the VIN?
The service manual provides vehicle-grade codes as part of the VIN breakdown.
For the 2002 RSX, it lists:
0 — Type-S
8 — RSX
It also identifies Canadian-market RSX and Premium configurations separately.
However, the VIN should be treated as identification of how the vehicle was originally manufactured—not proof that its original drivetrain is still sitting underneath the hood.
That’s where the engine and transmission numbers become useful.
Where Is the Engine Number on an Acura RSX?
The RSX has an identification number stamped on the engine itself.
The factory identification diagram specifically distinguishes the engine number from the VIN and transmission identification numbers.
Checking that number can be especially useful when inspecting:
- A used RSX
- A replacement engine
- A suspected engine swap
- A salvage vehicle
- A project car with an unknown history
- An engine being sold separately
Don’t automatically assume an RSX Type-S still contains the engine it left Japan with.
Two decades is plenty of time for someone with an engine hoist to alter history.
What Engine Numbers Were Used on the 2002 RSX?
The factory manual identifies two engines:
K20A2 — 2.0-liter DOHC VTEC, sequential multiport fuel injection, 200 hp
K20A3 — 2.0-liter DOHC VTEC, sequential multiport fuel injection, 160 hp
For 2002, the manual lists the engine-number sequences beginning with:
K20A2: 1400001-
K20A3: 1100001-
This makes the actual engine marking far more useful than relying on a valve-cover appearance or what the previous owner said was installed.
What About the 2003 RSX?
Honda changed the starting serial-number ranges for the next model year.
For 2003, the service manual lists:
K20A2: 2400001-
K20A3: 2100001-
That gives buyers and restorers another piece of evidence when determining whether a drivetrain is consistent with a particular model year.
It isn’t a complete vehicle-history investigation by itself, but it’s considerably better than “the guy I bought it from said it’s original.”
Where Is the Transmission Number on an Acura RSX?
The transmission carries its own identification number as well.
Honda’s identification diagram shows separate locations for the automatic transmission number and manual transmission number.
That becomes especially valuable on modified RSXs because transmissions are frequently replaced or swapped independently of the engine.
What Transmission Codes Did the 2002–2003 RSX Use?
The factory service manual identifies three transmission types:
MRMA — 5-speed automatic
W2M5 — 5-speed manual
X2M5 — 6-speed manual
The same three transmission identifiers are shown for the 2003 model year.
That means you don’t have to determine what transmission is installed based solely on the shift knob.
Which is fortunate, because replacing a shift knob takes approximately the same level of technical commitment as opening a jar of pickles.
Why Should You Check the Engine and Transmission Numbers?
For an ordinary commuter car, drivetrain identification may not matter very often.
The RSX is different.
These cars have spent decades being modified, raced, engine-swapped, transmission-swapped and reconstructed from donor cars. A clean-looking Type-S can contain components from several different vehicles.
Checking the identification numbers can help answer three separate questions:
What was the car originally?
Check the VIN.
What engine is installed now?
Check the engine identification.
What transmission is installed now?
Check the transmission identification.
Those aren’t necessarily the same story.
Can the VIN Prove an RSX Has Its Original Engine?
Not by itself.
The VIN identifies the vehicle’s original configuration, while the engine and transmission have separate identification markings.
Therefore, finding a Type-S VIN doesn’t independently establish that the currently installed engine or transmission is original.
Instead, use the VIN and drivetrain markings together when evaluating a car.
That distinction becomes increasingly important as surviving DC5s get older and genuinely unmodified examples become harder to find.
What Are the VIN Labels on RSX Body Panels?
Honda also used VIN-related parts marking as an anti-theft measure.
The service manual explains that certain major components were marked with the vehicle identification number. Original parts used self-adhesive labels, while replacement body parts received generic labels. The manual also warns technicians not to damage these labels during body repair.
That makes identification labels potentially useful when inspecting an older RSX for previous body repairs.
A missing or replacement label doesn’t automatically prove something sinister happened, but it can give you another reason to inspect the area carefully.
Quick Answer
A 2002–2003 Acura RSX has separate VIN, engine and transmission identification numbers.
The factory manual identifies the K20A2 and K20A3 engines and three transmission codes:
MRMA — 5-speed automatic
W2M5 — 5-speed manual
X2M5 — 6-speed manual
When buying or restoring an RSX, check all three identifiers rather than assuming the drivetrain matches the VIN.
