Engine-Codes - Chevrolet - P0146 CHEVROLET

P0146 CHEVROLET - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P0146 CHEVROLET Possible Causes

  • Faulty Heated Oxygen Sensor Bank 1 Sensor 3
  • Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
  • Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection

How is the P0146 CHEVROLET code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

Replacing the O2 Sensor 3 usually takes care of the problem

What is the cost to diagnose the P0146 CHEVROLET code

Labor: 1.0

The cost to diagnose the P0146 CHEVROLET code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

Current amperage in the rear heated oxygen sensor heater circuit has no activity.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

P0146 CHEVROLET Meaning

The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 3.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.

More Information

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