03 Cadillac CTS O2 Sensor Replacement

The 2003 Cadillac CTS has two oxygen sensors, one upstream and one downstream. The upstream sensor is located before the catalytic converter, and the downstream sensor is located after the catalytic converter.

The oxygen sensors monitor the amount of oxygen in the exhaust gas. The engine computer uses this information to adjust the air-fuel ratio to ensure optimal engine performance and emissions control.

If an oxygen sensor fails, it can cause a number of problems, including:

  • Reduced fuel economy
  • Increased emissions
  • Poor engine performance
  • Illuminated check engine light

If you notice any of these problems, it is important to have your oxygen sensors checked by a qualified technician.

The following are the part numbers for the oxygen sensors in the 2003 Cadillac CTS:

  • Upstream oxygen sensor: 213-1515
  • Downstream oxygen sensor: 213-1516

These sensors are available from most auto parts stores.

Replacing an oxygen sensor is a relatively simple task, but it is important to follow the manufacturer’s instructions carefully. If you are not comfortable replacing the sensor yourself, you can have it done by a qualified technician.

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