Engine-Codes - Toyota - P0125 1997 TOYOTA CAMRY

P0125 1997 TOYOTA CAMRY - Insufficient Coolant Temperature for Closed Loop Fuel Control

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

P0125 1997 TOYOTA CAMRY Possible Causes

  • Faulty Oxygen (O2) Sensor (Air/Fuel Sensor for California Models)
  • O2 sensor harness is open or shorted
  • O2 sensor electrical circuit poor connection
  • Fuel system
  • Air induction system
  • Fuel Injector
  • Faulty Engine Control Module (ECM)

How is the P0125 1997 TOYOTA CAMRY 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 P0125 1997 TOYOTA CAMRY code

Labor: 1.0

The cost to diagnose the P0125 1997 TOYOTA CAMRY 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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Possible Symptoms

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

P0125 1997 TOYOTA CAMRY Meaning

To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three–way catalytic converter is used, but for the most efficient use of the three–way catalytic converter, the air–fuel ratio must be precisely controlled so that it is always close to the stoichiometric air–fuel ratio.
The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air–fuel ratio.
This is used to detect the oxygen concentration in the exhaust gas and provide feedback to the computer for control of the air–fuel ratio.
When the air–fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the oxygen sensor informs the ECM of the LEAN condition (small electromotive force: < 0.45 V).
When the air–fuel ratio is RICHER than the stoichiometric air–fuel ratio the oxygen concentration in the exhaust gas in reduced and the oxygen sensor informs the ECM of the RICH condition (large electromotive force: > 0.45V).
The ECM judges by the electromotive force from the oxygen sensor whether the air–fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the oxygen sensor causes output of abnormal electromotive force, the ECM is unable to perform accurate air–fuel ratio control.
The oxygen sensors include a heater which heats the zirconia element. The heater is controlled by the ECM.
When the intake air volume is low (the temp. of the exhaust gas is low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.

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