Oxygen sensors play a critical role in both engine management and emissions control. When an O2 (oxygen) sensor walk bad, it’ll reason your Pontiac cool Prix‘s engine come run much less efficiently.

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Your grand Prix deserve to exhibit symptoms when the Oxygen sensor has actually gone bad. Or, it may exhibit none at all. Regularly enough, the only sign the the difficulty at all is the company engine soon light being on.

The an excellent news is, if you end up discovering that the oxygen sensor is bad, they really aren’t that expensiveto replace.

Bad Oxygen Sensor Symptoms: Pontiac grand Prix

Oxygen sensors can adjust the way that your cool Prix’s engine runs. Most of the time, the inspect engine light will come on. It’s a great thing that the check engine light would certainly come on, as there is much more than one oxygen sensor, and they have the right to be challenging to get to and also test.

The trouble codes connected with the OBDII scan will reveal which sensor is in ~ fault and why the is poor (at the very least what the computer thinks is wrong). The is really rare because that there to it is in a trouble with one oxygen sensor, and also not have the check engine light come on.

Typical Oxygen Sensor

Here are the most typical symptoms the a poor oxygen sensor in your cool Prix:

Service Engine shortly Light

More regularly than not, when an oxygen sensor in your grand Prix walk bad, it will certainly throw a diagnostic problem code. There are plenty of oxygen sensor associated codes.

These password correspond with what side of the engine they room on (known as the “bank” because that cylinder bank) and how far down stream they are. For instance, an oxygen sensor at financial institution 1 – sensor 1 would certainly be:

financial institution 1- side of the engine through the first cylinder in the shooting order. This method that you should look up the shoot order for your details model year and engine. Sensor 1- Sensor 1 would be the an initial O2 sensor in the line of sensors beginning with the exhaust manifold and making its method back to the exhaust pipe. One Oxygen sensor the is in between the catalytic converter and also the engine is known as an “upstream” sensor. Oxygen sensors after the catalytic converter space “downstream sensors”. Together a rule, the upstream sensor is more important because that engine timing and air/fuel ratios.

By using a OBDII scanner you have the right to determine precisely which sensor is bad, and also what is wrong through it.

Loss In Fuel Economy

Your cool Prix’s oxygen sensors room responsible because that helping to save your engine to run at optimal efficiency. The engine management computer uses the data from all of the O2 sensors to store the air/fuel mixture optimized. A poor oxygen sensor can impact the mixture greatly.

Without gift able come optimize the air fuel ratio, combustion isn’t as efficient, and also fuel mileage suffers. Over there could also potentially be raw fuel that enters the exhaust. This fuel deserve to hurt the catalytic converter.

Bad smell Exhaust

One that the most typical symptoms the an oxygen sensor has actually gone bad is exhaust that does not smell good. The odor is often described as “rotten eggs” or sulfuric. One of two people way, choose with rotten food, “the nose knows”.

Engine to run Rough

Without the ideal air/fuel mixture, her engine won’t run as smoothly as it should. This is particularly true if the mixture end up as well lean.

While a rough running engine can be a authorize of a poor oxygen sensor, that is regularly a authorize of a misfire as well.

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Failed Emissions

Often enough, over there won’t be any type of noticeable signs of a bad oxygen sensor. You’ll go to get an emissions inspect done, and also your grand Prix stops working the test. There is no a examine engine light, it can be tough to lock down specifically what would reason the vehicle to fail, but oxygen sensors are one of the an ext common causes.

Grand Prix bad O2 Sensor symptom & Causes: Conclusion

There might or might not be any type of noticeable symptoms once your Pontiac cool Prix’s oxygen sensor(s) walk bad. The is smart to usage a scan tool to recognize whether or no there is one OBDII problem code associated with any type of of the sensors. Great luck diagnosing your grand Prix!