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I have a 2004 Subaru Outback.check engine light code reads P0030 which is caused by the left bank oxygen sensor.What is the correct way,or steps to install this part correctly?

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Posted on Jan 02, 2017

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SOURCE: Check Engine Light?

there are 3 one on each side of eng. on the Y pipe one behind the cat. convertor. not to hard change

Posted on Oct 22, 2008

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SOURCE: Service Engine soon light Code P0133

I just came from an Autozone, and then spoke with 2 Hyundai dealership service departments and they all three stated the P0113 code is the Intake Air Temperature sensor (IAT, also referred to as the Mass Air Pressure - MAP - sensor) on the engine, not an O2 sensor found in the exhaust system.

Posted on May 27, 2009

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SOURCE: check engine light is 1 sensor1 oxygen sensor

if u have one oxygen sensor then u need to take a deep look at the bottom of ur car it will be somewhere at the Exhaust pipe if u have a catalytic converter then u will have two oxygen sensors one before the catalytic converter & the other will be after the catalytic converter. Note: the catalytic converter is located at after a little bit of beginning in Exhaust pipe.

Posted on Jun 06, 2009

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SOURCE: how do u replace an oxygen sensor on a 95 dodge avenger?

It is on your intake system, should be visible close to your air filter, it is simple to replace, just pop the old one off, and replace with the new one, I'm not sure on that specific model where it is located but it IS on the intake. It is fairly simple to replace. If you have any problems, or questions lmk.

Posted on Feb 17, 2012

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2 Answers

How many o2 sensors a Cadillac Deville 2000 has. I find 3 and replace them but still I have P0155 code for B2S1? Need help!

Which engine ? Some have four and always double check the connections as they can set the codes .

Mar 01, 2016 | Cadillac Cars & Trucks

1 Answer

P0037 code subaru outback I have replaced the cat and both o2 sensors and the same code comes up

I'm sorry you spent that money if this was the original code.

The code means one of the O2 sensors has a faulty heater or the power circuit for the heater is bad. The sensor is not heating up as fast as it should. Since you have replaced the sensor you would need to check the power circuit for the heater.

P0037 SUBARU Description 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.

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.
Read more:

Sep 14, 2012 | 2000 Subaru Outback

1 Answer


Bank one is always the same is of the engine as the number one cylinder. Bank 2 is the opposite side. Sensor 1 is always before the cat. Sensor 2 is always after the cat.

Aug 13, 2012 | Cars & Trucks

1 Answer

I have p2243, p0171, p0030 code on my 2005 hyundai elantra what does it mean

P2243 Oxygen reference voltage circuit/open,this is a enhance code.
P0171 Fuel system lean bank 1, this is a generic code,
P0030 Oxygen heater control circuit open or shorted to ground,this is a enhance code, You are going to spend time and money trying to diagnosis this 02 sensor, just replace it,when a 02 sensor fails the ECM defaults to a subsituted value 3_27_2012_6_12_26_am.jpg

Mar 26, 2012 | Hyundai Elantra Cars & Trucks

2 Answers

P0138 and p0158

These codes, po 138 bank 1 sensor 2 shorted to voltage and code po158 means bank 2 sensor two shorted to voltage. these are the two rear oxygen sensors in the exhaust system. there two up frt and two in the rear, check the wiring on the two rear sensors, make sure that the wiring is not cut or stuck between metal. if the wiring is good then replace both rear sensors, when you get them ask for the left and right after the cat sensors. or bk1 s2 and bk2s2. after replacing them reset the computer. go to an auto parts sotre or if you have a code reader you can do it. hope this helps good day.

Feb 19, 2012 | 2004 Dodge Stratus

1 Answer

Check engine light comes on every 200 or so miles, code P0420. O2 sensor has been replaced. I read that there was a bad batch of catalytic converters in this model. Any other easy tests or fixes?

p0420 is set when the convertor is unable to store oxygen in the minerals used in the convertor. the lack of oxygen to mix with the exhaust gases causes the O2 sensor to set the code. if the O2 sensor has been replaced the only other thing to do is replace the convertor. you can check with the Subaru dealer and let them run your VIN to see if you had one of the defective convertors.

Aug 01, 2011 | 2001 Subaru Outback

2 Answers

What is the code p00300

this is an obd2 trouble code table, it can help you understand the meaning of code.
for po300:
Possible causes of OBD code P0030:
Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection - Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse - Faulty Engine Control Module (ECM) The Error code is generally activated on detection of the following conditions: The P0030 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit
Possible Solutions:
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. HO2S Heater Control Circuit Bank 1 Sensor 1 is the generic definition for the P0030; however your vehicle's manufacturer may have a different definition and information for the P0030 code.
hope help.

Jun 22, 2011 | Nissan Altima Cars & Trucks

1 Answer

1995 Cadi SLS Codes, P0030 & P0036, Ckt Fuse or Relay Defective, checked fuse ok, where is relay located?

Hi there,

P0030 = HO2S Heater Control Circuit (Bank 1 Sensor 1) - No.1 Heated Oxygen sensor on bank 1.
P0036 = HO2S Heater Control Circuit (Bank 1 Sensor 2) - No. 2 Heated Oxygen sensor on bank 1

For both of these to trigger on the same bank, means most likely an Open or Short to Ground condition (somewhere on the Bank 1 circuit) stopping the HO2 sensors from reaching their working temperature.

Check the following in this order:

1) Using a multimeter, check 'continuity' of the Oxygen circuit FUSE terminals (don't rely on visual inspection alone) or replace fuse with a known good one.
2) Check for moisture getting into both oxygen sensor connector terminals (bank 1).
3) Check for good connection at Oxygen sensors (bank 1).
3) Have both heated oxygen sensors on Bank 1 tested (ensure their values are to specification).
4) Check HO2 pin-outs of the PCM for correct voltage.

Only replace the HO2 sensors as a last resort (if out of spec).

Then engine department relay centre & fusebox location is behind the washer bottle, but I believe the HO2 sensors are connected direct to the PCM, not a relay.


"If this has helped you in any way, please rate this solution"

May 07, 2011 | Cadillac Seville Cars & Trucks

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Check engine light on. P0325, P0420 2000 Subaru


Nov 13, 2009 | 2000 Subaru Outback

1 Answer

How do you reset engine check light on 2004 Subaru Outback?

u can clear/reset the check engine light either with a scan tool, hit clear codes, or u can just disconnect the battery, the scanner clearing method is preferred as disconnecting the battery can cause temporary stalling issues.

Jun 06, 2009 | 2004 Subaru Outback

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