What is the engine code for the MR2 SW20?
The MR2 SW20 uses 3S-GTE for the turbo model and 3S-GE for the naturally aspirated version.
The second-generation MR2 (SW20) was produced from 1989 through 1999 and came with two main 2.0-liter four-cylinder engines: a turbocharged 3S-GTE for the MR2 Turbo and a naturally aspirated 3S-GE for the NA MR2. Engine codes can vary by market (for example, 3S-GTEU in some US-market cars). To be certain, check the code stamped on the engine block or consult the VIN/door jamb sticker and the official documentation.
Turbo vs NA engines
Before comparing the two engine options, it helps to understand how the codes differentiate the engines and what that implies for performance and maintenance.
Engine code conventions
The 3S-GE designation denotes a 2.0-liter naturally aspirated engine in the 3S family. The 3S-GTE indicates a turbocharged version of the same family. The trailing letters and suffixes identify market and tuning variations (for example, some North American cars used 3S-GTEU).
- 3S-GE: 2.0-liter naturally aspirated engine used in the MR2 NA and other Toyota models.
- 3S-GTE: 2.0-liter turbocharged engine used in the MR2 Turbo; some markets used 3S-GTEU as a local designation.
In practice, the turbo model delivers significantly more power and different reliability and maintenance considerations (turbo wear, intercooler, boost control) compared with the naturally aspirated 3S-GE.
Where to locate and verify the engine code
To confirm the exact engine code for your SW20, use these verification methods.
- Check the engine block casting number and stamping: usually near the front or side of the block.
- Inspect the label on the timing belt cover or header area; some cars have a metal plate with the engine code.
- Review the VIN sticker or door jamb plate for the engine specification when accompanied by the model line.
- Consult the owner's manual or the service manual for the original engine code tied to your VIN.
Having the exact code helps with parts compatibility, maintenance schedules, and verifying the vehicle's original spec in case of replacements or remapping.
Summary
The MR2 SW20’s engine codes distinguish turbo and NA variants: 3S-GTE for the MR2 Turbo and 3S-GE for the naturally aspirated MR2. Always verify the code on the engine itself or via official documentation to ensure you’re working with the correct parts and specifications for your car.
