What kind of O2 sensor does a Chevy Silverado have?

Today I’ll be showing you how to test the primary or upstream O2 sensor in a 2004 Chevy Silverado with a 5.3 liter Vortec engine in it. The upstream Silverado O2 sensor is also known as the primary or front oxygen sensor. Because there’s two of these upstream sensors, I’ll be showing you how to test both in your GEN III Chevy truck.

What are the O2 wires on a Chevy Silverado?

After you’ve installed the new upstream sensor, use your OBDII scan tool to clear your Silverado check engine light. The other wires in your Silverado upstream O2 harness are PIN A for HO2S Low Signal, and PIN B for HO2S High Signal. For all Bank 1 oxygen sensors, PIN A is usually a TAN colored wire, and PIN B is a PURPLE wire with a WHITE stripe.

How does the O2 sensor work on a truck?

O2 sensors measure the oxygen levels in your truck’s exhaust gas before and after passing through the catalytic converter. By measuring the amount of oxygen leftover after engine combustion, the truck’s on-board computer can adjust the air-to-fuel ratio accordingly.

What to do if your O2 sensor is bad?

The trouble codes associated with the OBDII scan will reveal which sensor is at fault and why it is bad (at least what the computer thinks is wrong). It is very rare for there to be a problem with an oxygen sensor, and not have the check engine light come on. Here are the most common symptoms of a bad oxygen sensor in your Silverado:

Where is the oxygen sensor in the engine?

An Oxygen sensor that is between the catalytic converter and the engine is known as an “upstream” sensor. Oxygen sensors after the catalytic converter are “downstream sensors”. As a rule, the upstream sensor is more important for engine timing and air/fuel ratios.

What causes a bad O2 sensor on a Chevy Silverado?

While a rough running engine can be a sign of a bad oxygen sensor, it is often a sign of a misfire as well. Often enough, there won’t be any noticeable signs of a bad oxygen sensor. You’ll go to get an emissions check done, and your Silverado fails the test.

Where is the oxygen sensor on an Audi A3?

For instance, an oxygen sensor at bank 1 – sensor 1 would be: Bank 1- Side of the engine with the first cylinder in the firing order. This means that you need to look up the firing order for your particular model year and engine.

What does the Check Engine light on a Chevy Silverado mean?

When the upstream Chevy Silverado oxygen sensor goes out in your truck, you’ll see a warning light turn on. This is also known as your Chevy Silverado check engine light. This code tells you that your engine computer is receiving a signal from the front O2 sensor that’s out of range, or no signal at all.

When to run the downstream O2 sensor test?

IMPORTANT: Perform the downstream oxygen (O2) sensor tests (in this tutorial) with a completely cold engine. If the engine has been running, the upstream and downstream O2 sensors will be EXTREMELY HOT. If the engine is hot, let it cool down completely.

What does the knock sensor on a Chevy Silverado do?

The amount of AC voltage that the knock sensor produces is proportional to the amount and strength of the engine knock. Once your Chevrolet Silverado or GMC Sierra’s fuel injection computer receives the knock sensor’s signal, it’ll then retard ignition timing to reduce/eliminate the engine knock.

Why does the Check Engine light come on on a Chevy Silverado?

Oxygen sensors can change the way that your Silverado’s engine runs. Most of the time, the check engine light will come on. It’s a good thing that the check engine light would come on, as there is more than one oxygen sensor, and they can be difficult to get to and test.

How do you remove an O2 sensor from a car?

Unplug the electrical wiring from the sensor. Squeeze the release tab and pull the plug out from the sensor housing. Remove the sensor by turning it counterclockwise with an O2 sensor removal tool.

Where is the bank 1 sensor on a Silverado?

Remember you are testing the HARNESS side of your Silverado O2 sensor. The pin you are checking for is PIN D on the harness. With the key inserted and ignition turned to the “ON” position you should have 12 volts of power here. The Bank 1 Sensor 1 Silverado O2 heater wire is a PINK wire.

What is the OBDII code on a Chevy Silverado?

P0158 is an OBDII code that occurs in many vehicles, including the Chevy Silverado. The code is triggered when: The voltage at the O2 sensor remains above threshold for 20 seconds or more; Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself; There are also some less likely problems that can cause P0158.

How to remove the O2 sensor from a Chevy Silverado?

Pull the wire harness free and disconnect it. Using a flat head screwdriver, pry out the metal clip securing the wire harness that’s directly connected to the O2 sensor. Use the 7/8″ Crescent wrench to remove the O2 sensor. You may need a breaker bar for extra leverage. Figure 8. B1/S1 O2 sensor location. Figure 9. B2/S1 O2 sensor location.

When to reset the ECU after changing an O2 sensor?

Sometimes an O2 sensor fails, and you need to replace it. Once you’ve replaced your vehicle’s O2 sensor, you’ll need to reset the ECU so it can properly gather information from the new O2 sensor.

Where is the oxygen sensor Bank 2, Senor 1 is located on?

Bank 2 is the passenger side of the engine,the sensor one is the sensor closest to the engine in the exhaust pipe-so basically it is the on on the paasenger side exahust pipe close to the manifold.Bank 1 is the drivers side and the #2 postion is after the convertor. frank, Chevrolet Technician. Category: Chevy. Satisfied Customers: 3,420.

What should the fuel pressure be on a 2001 Chevy Silverado?

Here is how you use it. Please feel free to ask a question or leave a comment. By the way, the normal fuel pressure for a 2001 Silverado is 50~55 PSI. Loading…

How does the oxygen sensor work on a Chevy Silverado?

Silverado oxygen sensors gather data from the exhaust and the air and send it to the engine’s computer. The amount of oxygen necessary for the best air-to-fuel ratio varies based on engine and atmospheric conditions, so it’s critical for the O2 sensor for Chevy Silverado to be fully functional.

Can you test the O2 sensor on a GM 4.3L?

Testing the oxygen sensor (commonly referred to as O2 sensors) on your 4.3L, 5.0L, or 5.7L GM vehicle is not that hard to do. Since oxygen sensors are not cheap and sometimes the PCM (Powertrain Control Module = Fuel Injection Computer) accuses them of being bad, when they aren’t, testing them is a good idea and this article will help you.

Are there any oxygen sensors on my GM mini van?

Your 4.3L, 5.0L, or 5.7L GM pick up, van , SUV, or mini-van comes equipped with several oxygen sensors, this article concentrates on testing the two that are before the catalytic converter ( O2S11 and O2S21 ). Important Suggestions And Tips. Symptoms Of A Bad Oxygen Sensor. Oxygen Sensor Basics. Where Are O2S11 And O2S21? Oxygen Sensor Test 1.

Where are the O2 sensors on a Silverado?

There are two types of O2 sensors on your vehicle: upstream and downstream sensors. They essentially serve the same purpose, but are located in the different parts of your Silverado. The downstream oxygen sensor is located behind your catalytic converter.