For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Remove the muffler. Visually inspect the muffler. Is there a restriction in the muffler? | -- | Go to Step 2 | Go to Step 3
2 | Replace the muffler. Refer to Muffler Replacement . Does the vehicle still have a loss of power and/or internal rattles? | -- | Go to Step 3 | System OK
3 | Inspect the catalytic converter. Is the honeycomb broken in the catalytic converter? | -- | Go to Step 4 | System OK
4 | Replace the catalytic converter. For the three-way catalytic converter, refer to Catalytic Converter Replacement . For the oxidation catalytic converter, refer to Oxidation Catalytic Converter Replacement . Does the vehicle still have a loss of power and/or internal rattles? | -- | -- | System OK