how to fix P0420 code on my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter

• Remove the upstream oxygen sensor:

  1. Locate the upstream O2 sensor before the catalytic converter.
  2. Use the O2 sensor socket to remove the sensor from the exhaust manifold.

• Install the new upstream O2 sensor:

  1. Apply anti-seize compound to the threads of the new sensor.
  2. Install the new sensor and tighten it to manufacturer specifications (typically around 30 ft-lbs).

• Repeat the process for the downstream oxygen sensor:

  1. Locate the downstream O2 sensor after the catalytic converter.
  2. Remove and replace it in the same manner.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, cutting tool (if necessary), gasket scraper
• Remove the catalytic converter:
  1. Unbolt the catalytic converter from the exhaust system, noting the orientation and position of gaskets.
  2. If necessary, cut the exhaust pipes using a cutting tool, ensuring a clean cut for reinstallation.
• Install the new catalytic converter:
  1. Position the new converter and secure it with bolts and new gaskets as necessary.
  2. Torque the bolts to the manufacturer specifications (usually around 30-40 ft-lbs).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use an OBD-II scanner to clear the P0420 code and reset the check engine light.