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Replace front O2 sensor - Cars & Trucks

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22mm wrench or O2 Sensor Wrench or Socket

Depends on the vehicle & location

Even look for it or use the internet for
info & a picture

Parts have to have a reason to need replacing

OBD Codes & Dash MIL Lamp, is NOT a reason,
if your not going to do any testing, to find a reason
for fault codes.

I replace NOTHING until tested & fail a test

Why would you ?

As you learn over time, there are items that
are included in Preventative Maintenance

Your oxygen sensors are one of those
They go at 100,000 miles
They are going to fail anyway & slow down, as far
as switching times go & lose proper fuel control

Posted on Nov 21, 2014


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How to fix a 0171 code

Your problem is being caused by a leaky power steering switch.

The switch develops a leak, which causes power steering fluid to seep into the engine wiring harness. The seepage eventually finds its way into the front O2 sensor, which then shorts out. The engine computer then starts reading a lean condition, and enriches the fuel/air mix going into the engine to compensate. However, since the shorted O2 sensor never responds to the extra fuel, the engine computer keeps shooting more and more excess fuel.

Replacing the O2 sensor by itself will not help matters, as you may have guessed. The seepage will have about a week or two to short out the new O2 sensor, then you will start seeing the same problem again.

The cure is to replace the leaky power steering switch (it's near the power steering pump), spray brake cleaner into the wiring harness until it drips off from near the front O2 sensor, let dry, and replace the front O2 sensor again. All of these actions must be completed, or you will see another recurrence of this exact problem.

Feb 18, 2014 | 2001 Dodge Durango

1 Answer

What dose the engine code po 1151 on a 1996 ford torse mean

Its an o2 sensor bank 2 sensor 1 which is the o2 sensor on the passenger side in front of the catalytic converter it has failed.Replace the o2 sensor and reset the computer.

Sep 08, 2012 | Cars & Trucks

1 Answer

Front o2 sensor is needing to be replaced

The front sensor should be in front of the catalytic converter.

Jul 06, 2012 | 2006 Ford Focus

2 Answers

Where is 2003 avalon o2 sensor(bank1-sensor1),(front upstream) ? can I install it myself without a lift?

The bank one sensor one O2 is located in the exhaust pipe before the Catalytic Converter, bank one is the cylinder bank that also contains the number one engine cylinder, in your car that would be the cylinder bank at the rear closest to the firewall (see diagram below). You will need to raise the car and crawl under it to replace the sensor and you will need a special O2 sensor socket. Remember always use safety stands to support the car when under the car for any repairs.

May 31, 2011 | 2003 Toyota Avalon

1 Answer

What is p1148

P1148 - Closed Loop Control Function Bank 1
This mean that the closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.

The Powertrain Control Module (PCM) or Electronic Control Module(ECM) monitor the function of the Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor by comparing the signal with the Rear O2 sensor.

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

Possible causes:
- Harness or connectors Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor 1 circuit is open or shorted.
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 heater

Possible solution:
- Repair harness or connector. If repair is needed
- Replaced Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1

Then, possible causes are faulty harness or connectors to the air fuel ratio sensor, a faulty air fuel ratio sensor (1) or faulty air fuel ratio sensor (1) heater. Most likely yes it is just faulty sensor. Just replace this devices and reset the stored codes.

Keep us updated.

Feb 10, 2011 | 2005 Nissan Altima

2 Answers

Catalyst system efficiency below threshold

is that the code you get from comp is PO420 eng light if so worst news either you have an exh leak between o2 sensor 1 and o2 sensor 2 or the front o2 sensor is lazy or the front catyletic converter is not working

basicaly code is only triggerd when engine is hot and the front o2 sensor and the rear o2 sensor read the same voltage when conv is working the front o2 sensor will fluctuate rapidly from 0v to 1v and rear o2 sensor will remain steady at 0.5v

try to explain best i can plz vote comment or reply if you need more help

Jan 17, 2011 | Chevrolet Astro Cars & Trucks

1 Answer

Codes po135 po741

code P0135 heated O2 sensor bank 1 sensor 1 , heater circuit ( front O2 sensor driver side ) replace O2 sensor

code P0741 this is a transmission code TCC ( torque converter clutch ) stuck off. most likely you need to replace the TCC switch.

Aug 09, 2010 | 1996 Cadillac DeVille

1 Answer

2002 blazer zr2 check engine light code is po155 bank 2 sensor 2 where is it and how do I check it

P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter

Feb 23, 2010 | 2002 Chevrolet Blazer

1 Answer


this can usually be set due to front O2 sensor malfunction
even though reading from front O2 sensor looks normall and not setting a code, its not reading correctly replace the front O2 sensor

Jun 26, 2009 | 2004 Isuzu Rodeo

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