DecodedCars2009 Cadillac STS
Trims, performance, features, fuel economy, safety and known problems — with the pros and cons against similar 2009 models.
- Class
- Midsize Cars
- Engines
- 3.6L 6-cyl, 4.6L 8-cyl
- Drivetrain
- Rear-Wheel Drive, 4-Wheel or All-Wheel Drive
- Fuel
- Regular Gasoline, Premium Gasoline
- MPG (best)
- 20 combined · 17 city / 26 hwy
- Length
- –
- Curb weight
- –
- NHTSA rating
- Not rated
- Recalls
- 0 campaigns
Pros & cons
What's good
- AWD / 4WD available
- No recalls so far
Watch out for
No weak spots against similar models in the data.
Calculated from EPA, NHTSA and vPIC data against 14 similar 2009 models — not a review. How we calculate this →
Overview
The 2009 Cadillac STS is a midsize car offered with 2 engines (3.6L 6-cyl and 4.6L 8-cyl) and rear-wheel drive and 4-wheel or all-wheel drive.
EPA rates its most efficient version at 20 MPG combined (17 city / 26 highway), 7% worse than the 2009 midsize car average of 21.6 MPG, for an estimated $3,350 a year in fuel.
It has 0 recall campaigns on file and owners have filed 11 complaints with NHTSA since 2015, most often about the air bags.
What changed for 2009
No changes to engines, powertrains, drivetrains, size, EPA ratings or NHTSA crash rating compared with the 2008 STS — a carry-over year in the data.
Compared with 2008; trim, feature and price changes aren't covered. See the 2008 STS →
Engines, MPG & running costs
| Version | Engine | Transmission | Drive | City / Hwy / Comb | vs. class | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|---|---|
| STS | 3.6L 6-cyl | Automatic (S6) | Rear-Wheel Drive | 17 / 26 / 20 | -7% | $3,350 | 444 |
| STS AWD | 3.6L 6-cyl | Automatic (S6) | 4-Wheel or All-Wheel Drive | 17 / 26 / 20 | -7% | $3,350 | 444 |
| STS | 4.6L 8-cyl | Automatic (S6) | Rear-Wheel Drive | 15 / 24 / 18 | -17% | $4,550 | 494 |
| STS AWD | 4.6L 8-cyl | Automatic (S6) | 4-Wheel or All-Wheel Drive | 15 / 22 / 17 | -21% | $4,850 | 523 |
EPA estimates; "vs. class" is combined MPG against the 2009 EPA class average. How we calculate this →
Safety ratings & technology
NHTSA has not published 5-Star ratings for the 2009 Cadillac STS under the current (2011+) test program.
Similar 2009 midsize cars
| Model | Best MPG / range | NHTSA overall | Recalls |
|---|---|---|---|
| 2009 Cadillac STS (this car) | 20 MPG | Not rated | 0 |
| 2009 BMW 5 Series | 21 MPG | Not rated | 3 |
| 2009 Mercedes-Benz E-Class | 26 MPG | Not rated | 0 |
| 2009 Audi A6 | 21 MPG | Not rated | 4 |
| 2009 Lexus LS | 21 MPG | Not rated | 2 |
| 2009 Lexus ES | 22 MPG | Not rated | 4 |
| 2009 Cadillac CTS | 21 MPG | Not rated | 4 |
Recalls (0)
No vehicle recalls on file with NHTSA for the 2009 Cadillac STS.
Check your VIN for open recalls at NHTSA ↗Not every 2009 Cadillac STS is affected — only a VIN check confirms your car.
Owner-reported problems
Unverified owner reports; best-sellers collect more.
Used 2009 Cadillac STS buyer's checklist
- Run the VIN at nhtsa.gov/recalls. No recalls on file, but check anyway.
- Air Bags — 5 owner reports. Confirm the airbag warning light turns off after start-up and any airbag recall was completed.
- Electronic Stability Control (Esc) — 4 owner reports. Ask the seller and mechanic specifically about this system.
- Service Brakes — 2 owner reports. Brake firmly from speed; check for pulling, pulsing pedal or ABS warning light.
- Mileage to watch. Owners typically reported problems around 80,000 miles; ask what was repaired near that point.
- Before you pay: service records, a history report and an independent inspection.
Generated by DecodedCars from NHTSA recalls and owner complaints for the 2009 Cadillac STS. Not a substitute for a professional inspection.
Other STS years
Compare all years →Sources: EPA, NHTSA, Transport Canada, Wikimedia Commons. Not affiliated with NHTSA, the EPA or Cadillac. How we calculate this →