O2 sensor nissan altima 2002

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Testing The Oxygen Sensor 1 Heater (2002-2003 2.5L Nissan Altima)

This tutorial will help you to test the front O2 sensor heater on the 2000-2003 2.5L Nissan Altima.

Testing the front O2 sensor's heater involves making sure that the heater is getting power and then testing its internal resistance.

All of the test steps are explained in a step-by-step manner and you can also find the O2 sensor wiring diagram here: Heated Oxygen Sensor 1 Circuit Diagram.

Symptoms Of A Defective O2 Sensor 1 Heater

When the O2 sensor fails you're gonna' have a trouble code lighting up a check engine light on your Nissan Altima's instrument cluster.

You're gonna' see one of the following trouble codes registered in your Nissan Altima PCM's memory:

  1. P0031: Front Heated Oxygen Sensor Heater 1 Circuit Low Input.
  2. P0032: Front Heated Oxygen Sensor Heater 1 Circuit High Input.

Front O2 Sensor Basics

Testing The Oxygen Sensor 1 Heater (2002-2003 2.5L Nissan Altima)

The O2 sensor's heater is tasked with heating up the O2 sensor as soon as the engine starts and keeping it hot even when the engine is running (especially at idle).

All of this is so that the O2 sensor can start sensing the oxygen content of the exhaust and control emissions as soon as the engine starts and while it's running.

As you're probably already aware, the front O2 sensor has 4 wires sticking out of its connector.

To test the O2 sensor #1's heater, we need to know which wire supplies it with power.

We also need to know which terminals, of the connector of the O2 sensor itself, are part of the heater element circuit inside the O2 sensor.

2002-2003 2.5L Nissan Altima
PinWire ColorDescription
1WHTO2 Signal (PCM)
2ORG/BLKHeater (PCM)
3RED/YELHeater Power (+)
4BLKGround (-)

You can see these wires in the O2 sensor wiring diagram here: Heated Oxygen Sensor 1 Circuit Diagram.

TEST 1: Making Sure The O2 Sensor Heater Is Getting Power

Making Sure The O2 Sensor Heater Is Getting Power. Testing The Oxygen Sensor 1 Heater (2002-2003 2.5L Nissan Altima)

The O2 sensor #1's heater needs 12 Volts to activate. So our first test we're going to make sure sure that the O2 sensor is getting power.

This power comes from fuse #15 (15 amp) of your 2002-2003 2.5L Nissan Altima's dash fuse box. The wire that carries these 12 Volts to the O2 sensor is the red with yellow stripe (RED/YEL) wire.

We'll use a multimeter to check for these 12 Volts.

CAUTION: Since the O2 sensor is located in the exhaust stream, it can get very hot when the engine is running. It can stay very hot even after the engine has been turned off. Let the engine cool down completely before attempting any of the tests. Be careful and take all necessary safety precautions.

NOTE: This test is done on the O2 sensor connector that belongs to the engine wiring harness. This connector has female terminals.

These are the test steps:

  1. 1

    Disconnect the front O2 sensor from its electrical connector.

  2. 2

    Place your multimeter in Volts DC.

  3. 3

    Connect the red multimeter test lead to the RED/YEL wire.

  4. 4

    Connect the black multimeter test lead directly to the battery negative (-) terminal.

  5. 5

    Turn the key on but don't crank or start the engine.

  6. 6

    The multimeter should read 10 to 12 Volts DC.

    Turn the key off when done.

Let's take a look at your test results:

Let's examine your test results:

CASE 1: The RED/YEL wire has 10 to 12 Volts. This is the correct and expected test result.

Now that you've confirmed that your Altima's O2 sensor's heater is getting power, the next step is to make sure that it's getting Ground. For this test go to: TEST 2: Testing The Heater Element's Resistance.

CASE 2: The RED/YEL wire does not have 10 to 12 Volts.. Without power the front O2 sensor's heater will not activate.

The most likely cause of this missing power is a blown fuse. Check that the #15 dash fuse box fuse is not blown.

Sours: https://easyautodiagnostics.com/nissan/2.5L/front-oxygen-sensor-heater-1
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2002-2006 Nissan Altima Oxygen Sensor - Upstream - Bosch 15525

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2002-2006 Nissan Altima Oxygen Sensor Bosch Reviews

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2002-2006 Nissan Altima Oxygen Sensor - Upstream - Bosch 15525Click to Enlarge

Bosch 15525
Oxygen Sensor

Review Fitment Notes

Part Number:15525


  • Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
  • Direct Fit includes OE Connector for easy installation
  • Performance meets or exceeds OE specifications
  • True Direct-fit OE connectors and harness


Shipping Options:Ground

This Part Fits:

Catalog: B

Notes: Engineered Oxygen Sensor

Position: Upstream

2002 Nissan Altima 2.5L 4 Cyl
2003 Nissan Altima 2.5L 4 Cyl

This Part Fits:

Catalog: B

Notes: Engineered Oxygen Sensor

Position: Downstream

2004 Nissan Altima 2.5L 4 Cyl
2005 Nissan Altima 2.5L 4 Cyl
2006 Nissan Altima 2.5L 4 Cyl

This Part Fits:

Catalog: B

Notes: Engineered Oxygen Sensor -- Located After Secondary Converter

Position: Downstream

2005 Nissan Altima 3.5L V6
2006 Nissan Altima 3.5L V6

More Oxygen Sensor Brands for 2002-2006 Nissan Altima

Description: Nissan Altima Upstream Oxygen Sensor. Brand: Bosch. Fits Years: 2002, 2003, 02, 03. Engineered Oxygen Sensor - 15525

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Sours: https://www.partsgeek.com/qzn2f9d-nissan-altima-oxygen-sensor.html
Top 5 Problems Nissan Altima Sedan 3rd Generation 2002-06

How many 02 sensors does a Nissan Altima have?

A vehicle may have two to five oxygen sensors, and sometimes even more.

Click to see full answer.

Also asked, how many o2 sensors does a 2002 Nissan Altima have?

2002-2004 Nissan Altima with 3.5 Engine O2 Sensor Location. Nissanhelp.com.

Secondly, how many o2 sensors does my car have? Some vehicles can have 8 or more oxygen sensors fitted. Oxygen sensors are located within the exhaust stream, there is at least one oxygen sensor located before the catalytic converter and typically one in each exhaust manifold.

Likewise, people ask, how many o2 sensors does a 2007 Nissan Altima have?

16 Oxygen Sensor

How many o2 sensors does a 2012 Nissan Altima have?

We currently carry 18 Oxygen Sensor products to choose from for your 2012 Nissan Altima, and our inventory prices range from as little as $102.99 up to $234.53.

Sours: https://askinglot.com/how-many-02-sensors-does-a-nissan-altima-have

2002 nissan o2 sensor altima

2002 Nissan Altima - Oxygen/Air-Fuel Ratio Sensor

Your oxygen sensor, sometimes called an O2 sensor or air-fuel ratio sensor, measures the oxygen level in your exhaust gases. It then relays this information to the ECU to adjust the fuel mixture. If there is too much oxygen in the exhaust, the fuel mixture is too lean, but too little oxygen indicates a rich fuel mixture. If your exhaust sensor is working poorly, or not at all, you may notice a decrease in fuel efficiency, poor engine performance, stalling, hesitation, or a rough idle. The incorrect information being supplied to the ECU creates a poor fuel mixture, and your vehicle will perform poorly. If you have one or more bad oxygen sensors, O'Reilly Auto Parts carries replacement oxygen sensors for most cars, trucks, and SUVs.

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Sours: https://www.oreillyauto.com/shop/b/fuel---emissions-16775/emission-sensors-17086/oxygen-air-fuel-ratio-sensor-12041/55cf07c4c2a7/2002/nissan/altima
2005 Nissan Altima oxigen sensor

How to Replace O2 Oxygen Sensor 02-03 Nissan Altima

Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.

Hi, I'm Don from 1A Auto. I hope this how-to video helps you out, and the next time you need a part for your vehicle, think of 1AAuto.com. Thanks.

In this video, we're going to show you how to replace an upstream O2 sensor on this 2003 Nissan Altima with the 2.5L, 4-cylinder engine. The items you'll need from this are a new upstream O2 sensor from 1AAuto.com, a flat blade screwdriver, a 7/8 inch O2 socket from 1AAuto.com, and a ratchet. In our worst case scenario, we'll also need a pair of wire cutters and a pair of regular 7/8 socket. Because of the location of this O2 sensor, you can't actually use a 7/8 inch wrench, but you do need this special socket with the cut out that accommodates the wires on the O2 sensor. It's the only way to reinstall a new O2 sensor on this particular vehicle. We do sell it; we offer it in kits with the O2 sensor. To remove it, we do end up actually using this 7/8 socket and just cutting the wires, and we'll explain more of that later.

The upstream O2 sensor we're working on is located right here. Disconnect the O2 sensor harness. It's the green connection. You have to press a tab and pull it apart. Now you'll see that the harness is actually clipped on. You just want to unclip that and pull it down. Now here's that special socket, and you just slip it right over the O2 sensor. Now attach your ratchet. That socket is good because you don't have to worry about the wires because they come right out of that slot. The only problem with it is the big slot in it lets the socket expand so if the O2 sensor is in there really tight (like this one is) the socket kind of expands and kind of slips on to the O2 sensor.

What we'll need to do is basically just cut that wire with a set of wire cutters. Then we're going to use a solid 7/8 inch socket and slide it right over there. It has to be a deep socket. Put the ratchet on there and remove the O2 sensor. Just pull the O2 sensor up and out.

You can see the one on the top is the old one and it's in very rough shape. It's actually misshapen. The lower one is the new one from 1A Auto and it's an exact match.

You want to feed your new O2 sensor down into place, and just twist it in by hand to start. Now, you want to use that special O2 socket with cut out for the wires, and just tighten the O2 sensor into place. We'll fast-forward as Don does this. Now reconnect your harness and just clip that connector back up onto that bracket. Now you're all set.

We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Sours: https://www.1aauto.com/how-to-replace-o2-oxygen-sensor-02-03-nissan-altima/video/48844

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