Six spark plugs. The 2009 CTS uses a V6 engine with six cylinders, so there is one spark plug per cylinder.
Engine options for the 2009 CTS
The 2009 Cadillac CTS was offered with V6 powertrains. Depending on the trim, you could have either a 2.8-liter V6 or a 3.6-liter V6. Both configurations are six-cylinder engines, meaning there are six spark plugs in total.
- 2.8-liter V6
- 3.6-liter V6
Regardless of the exact engine, the CTS’s V6 setup requires six spark plugs—one for each cylinder. When performing maintenance, consider replacing all six at intervals recommended by Cadillac or your owner's manual, and use the proper torque specifications for the ignition coils and plugs.
Maintenance considerations
Spark plug replacement intervals can vary by engine type and driving conditions. For the 3.6-liter V6 commonly found in the 2009 CTS, consult the owner's manual or a dealer for the recommended replacement schedule and plug type to ensure optimal performance.
In summary, the 2009 Cadillac CTS has six spark plugs and six ignition coils, one per cylinder, regardless of whether you have the 2.8L or the 3.6L engine.
Summary
The 2009 Cadillac CTS uses a six-cylinder V6 engine, so it has six spark plugs in total.