Question about 2004 Toyota Camry
P0044 - HO2S Heater Control Circuit High (Bank 1 Sensor 3)
The P0044 is set when the ECM detects an excessively high voltage through the heated oxygen sensor heater circuit
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
- Engine Light ON (or Service Engine Soon Warning Light)
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit fuse
- Faulty Engine Control Module (ECM)
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
Hope helps (remember to rate this answer).
Posted on Mar 15, 2011
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Oct 28, 2017 | Cars & Trucks
Nov 27, 2013 | 2004 Toyota Camry
Jul 19, 2011 | Chevrolet Chevy Cars & Trucks
Apr 04, 2011 | 2001 Oldsmobile Alero
Mar 24, 2010 | 2004 Toyota Camry
Mar 13, 2009 | 2004 Toyota Camry
Oct 24, 2008 | 2002 Toyota Camry
Dec 11, 2016 | 2004 Toyota Camry
738 people viewed this question
Usually answered in minutes!