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P0420 2017 Toyota RAV4 Code - Catalyst System Efficiency Below Threshold Bank 1

- Code Popularity: 580 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0420 2017 Toyota RAV4?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Gas leak from exhaust system
  • Faulty Three-way Catalyst Converter Bank 1
  • Faulty Air Fuel Ratio (A/F) Sensor Bank 1 (Sensor 1 or Front Sensor or Upstream Sensor)
  • Faulty Heated Oxygen Sensor Bank 1 (Sensor 2 or Rear Sensor or Downstream Sensor)
  • Faulty Fuel Injector(s)
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How to Fix the DTC P0420 2017 Toyota RAV4?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

As the code description implies the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst Converter needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0420 2017 Toyota RAV4 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0420 2017 Toyota RAV4 Description

The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.
The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.
In order to detect any deterioration in the three-way catalytic converter, the ECM calculates the oxygen storage capacity of the three-way catalytic converter. This calculation is based on the voltage output of the heated oxygen sensor while performing active air-fuel ratio control.
The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air-fuel ratio control is performed for approximately 15 to 20 seconds. When it is performed, the ECM deliberately sets the air-fuel ratio to lean or rich levels. If the cycle of the waveform for the heated oxygen sensor is long, the oxygen storage capacity is great. There is a direct correlation between the heated oxygen sensor and the oxygen storage capacity of the three-way catalytic converter.
The ECM uses the oxygen storage capacity value to determine the state of the three-way catalytic converter. If any deterioration has occurred, the ECM illuminates the MIL and stored the DTC.
This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, which is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.
OBDII Code P0420 2017 Toyota RAV4 - Catalyst System Efficiency Below Threshold Bank 1 - AutoCodes.com
P0420 2017 Toyota RAV4 Code - Catalyst System Efficiency Below Threshold Bank 1

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