Check engine light on my 2003 sienna, DTC was

DTC P0135 O2 Sensor malfunction code check fuse for o2 sensor heater and ground.If the heater is not working then it will take more time on cold start to adjust injection. check connector o2 if corroded terminals clean it or change terminal. if all good change o2 sensor
hope it helps

Bank one sensor one is on the side with cylinder one and before the catalytic converter.
Please be aware the code is for the heater circuit which may mean the sensor is bad, or the sensor may be ok and the problem is in the heater circuit.

Check the fuses and replace any blown fuses. This code is for the heater circuit of the O2 sensor. The heater is powered by a fuse which may have blown if the heater or the sensor wiring was somehow grounded.

check the fuses if the fuse blew the heated side of the sensor will not work and still kick the code also a v-6 has 2 upstream o2 sensors

Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).


DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
or
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and P0155 may mean that one or more of the following has happened:

• O2 Heater element resistance is high
• Internal short or open in the heater element
• O2 heater circuit wiring high resistance
• open or short to ground in the wiring harness

In order to solve just...

Repair short or open or high resistance in wiring harness or harness connectors

Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

Hopoe this helps.

Code 135 is for a faulty heater in the O2 sensor. Since you have replaced the sensor the problem is probably the circuit or the power source for the heater.
You'll need to check the heater circuit next.

Sound like a DTC P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)

A code P0141 may mean that one or more of the following has happened:
* open or short to ground in the wiring harness
* O2 heater circuit wiring high resistance
* O2 heater element resistance is high
* Internal short or open in the heater element

Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.

The DTC (Data Trouble Code) P0135 is for the O2 sensor Heater Circuit Bank 1 Sensor 1. Bank 1 will always be the cylinder bank with the number one cylinder and spark plug, and the number one O2 sensor will be located before the catalytic converter and usually at the rear of the exhaust manifold or just after it. According to the firing order diagram bank one is the cylinder bank that is closest to the fire-wall and there should be an O2 sensor located there around the rear of the exhaust manifold or just after it. If the engine is a 4 cylinder then it will be the O2 sensor before or up-stream of the catalytic converter. Check for any damaged wiring or loose wire connector at the O2 sensor and if they are alright then replace the O2 sensor and then re-set the check engine light. (The auto part store should re-set the check engine light for you if you purchase the O2 sensor from them, and be certain that it is the correct and assembled O2 sensor for your vehicle and not a put together universal O2 sensor)

THAT is false you have to get your obd11 code erease witch a code reader or a scan tool and after that everithing should be ok

Hi,

I have not come accross a P2225 error code on a Toyota (Sienna). Best I can gather is this error indicates "NOx Sensor Heater Sense Circuit Intermittent (Bank 2)". on an OBDII Code Reader.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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