Engine-Codes - Toyota - P2A00 2002 TOYOTA HIGHLANDER

P2A00 2002 TOYOTA HIGHLANDER - A/F Sensor Circuit Slow Response Bank 1 Sensor 1

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

P2A00 2002 TOYOTA HIGHLANDER Possible Causes

  • Faulty Air fuel Ratio (A/F) Bank 1 Sensor 1
  • Air fuel Ratio (A/F) Bank 1 Sensor 1 harness is open or shorted
  • Air fuel Ratio (A/F) Bank 1 Sensor 1 circuit poor electrical connection
  • Fuel pressure
  • Fuel injector
  • Intake air leaks

How is the P2A00 2002 TOYOTA HIGHLANDER 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.

What is the cost to diagnose the P2A00 2002 TOYOTA HIGHLANDER code

Labor: 1.0

The cost to diagnose the P2A00 2002 TOYOTA HIGHLANDER 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?

The P2A00 Code is set when A/F sensor output voltage change value is below regular value against fuel trim change value.

Possible Symptoms

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


The Air-Fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output voltage, the ECM determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio. The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is deteriorating or not. A/F sensor response deterioration is determined by the ratio of the A/F sensor output voltage variation and fuel trim variation.

More Information

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