P2238 Positive Current Circuit Low on Toyota Camry 2004

Code P2238 is a code indicating the O2 sensor heater circuit is shorted causing the circuit voltage control to be low. This will cause the fuel feedback control to not work and the ECM to put the engine into failure mode or open loop fuel control. This will also cause the vehicle to fail emissions testing.

What causes a P2238?

P2238 is a generic code for the engine control module (ECM) in any vehicle manufactured from 1996 onward, and it’s triggered when there’s a short circuit in the heater control circuit of the O2 sensor. The ECM is the brain behind your engine. It manages the air-fuel ratio that keeps your car running safely.

Is Bank 1 Sensor 1 Left or right?

Bank 1 Sensor 1 means Upstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front.

How do I fix code P2238?

What repairs can fix the P2238 code?

  1. Replace the O2 sensor for an short circuit in the heater circuit.
  2. Repair the wiring connector or wiring to the O2 sensor for shorts.
  3. Replace the power relay for the heater circuit due to a burned out or shorted circuit that the pinpoint test indicated.

What is an air-fuel ratio sensor?

An air-fuel ratio meter monitors the air–fuel ratio of an internal combustion engine. Also called air–fuel ratio gauge, air–fuel meter, or air–fuel gauge, it reads the voltage output of an oxygen sensor, sometimes also called AFR sensor or lambda sensor.

How many O2 sensors does a 2004 Toyota Camry have?

There is one (sensor 1) in front of the catalytic converter and a second (sensor 2) located behind and beneath the catalytic converter.

What side is bank 1 on a Toyota?

Where is Bank 1 sensor 1 on a Toyota? As with any other vehicle, this depends on the engine type and drivetrain configuration. On most in-line engines, the Bank 1 sensor 1 will be located at the engine’s front side, near the cylinder head.

Where is bank 1 sensor 1 located?

Right after the catalytic converter.

How do I fix the air fuel ratio in my car?

What you do is take a screwdriver. And turn the screw. In until it slows down the engine. And then you pull it out a half a turn until it speeds back up do it on both sides of the carburetor.

How much does it cost to replace an air fuel ratio sensor?

How much is a new air fuel ratio sensor? Each one of these AFR sensors should cost anywhere from $50-250, depending on the make and model of your vehicle.

How do you test a Toyota air/fuel sensor?

So the sensor contains a pumping cell and a reference cell separated by a porous diffusion gap. So basically it's like two oxygen sensors smushed together in a sandwich.

What does P2A00 mean?

A P2A00 code means that the powertrain control module (PCM) has detected a voltage reading from the oxygen (O2) sensor for engine bank 1 that is outside of normal parameters.

How is P0171 diagnosed?

How does a mechanic diagnose the P0171 code?

  1. Assuming that no other trouble codes exist, a mechanic may diagnose the P0171 code by checking the engine for vacuum leaks with a vacuum gauge. …
  2. The fuel pressure sensor and MAF sensor (mass air flow) will also be checked with a fuel pressure gauge.

What causes a P0172 code?

What the P0172 code means. P0172 indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber. The ECU uses a number of instruments, such as the mass air flow sensor (MAF), oxygen sensors, and manifold absolute pressure (MAP) to monitor the air-fuel ratio of the engine.