How do you check cylinders 2004 Subaru WRX?

To check the cylinders on a 2004 Subaru WRX, you can perform a compression test. First, remove the spark plugs and connect a compression gauge to each cylinder, cranking the engine several times to get a reading. Compare the compression values across cylinders to ensure they are within the manufacturer's specifications, typically around 140-190 psi. If any cylinder shows significantly lower compression, it may indicate issues like worn piston rings or valve problems.