There are few components on your vehicle that can improve your overall power output than your supercharger. But while these can be powerful engine components, your vehicle also needs to monitor them to make sure that everything is working the way it should.
That’s where the boost pressure sensor comes in. But how do you know if you have a faulty boost pressure sensor, and what exactly does this sensor do? We’ll break it all down here before diving into how much it’s going to cost you if you do need to replace this sensor.
3 Symptoms of a Bad Boost Pressure Sensor
While the most common symptom of a bad boost pressure sensor is a check engine light, you might notice a few other issues like decreased engine performance if this happens. Below we’ve highlighted the three most common symptoms of a bad boost pressure sensor.
1. Check Engine Light
If you have a faulty boost pressure sensor, you’re going to have a check engine light. More specifically, you’re going to have a code P0236. If you have this engine code, there’s a good chance that you have a faulty boost pressure sensor, but it’s not the only thing that could be causing it.
You’ll still need to rule out an underlying electrical issue, and you’ll need to verify that there’s nothing wrong with your turbo or supercharger. If there is an underlying issue, then your boost pressure sensor is doing precisely what it’s supposed to, alerting you of an underlying problem.
2. Decreased or Increased Engine Performance
Your boost pressure sensor tells your ECM the actual output of your turbo or supercharger, so if it’s not reporting accurate numbers, the ECM will adjust to faulty readings. This will cause an overall decrease or increase in engine performance.
A faulty boost pressure sensor will cause more noticeable drops in performance in a turbocharged engine than a supercharged one but drops in engine performance can happen in both. That’s because even with a supercharged engine, the ECM doesn’t know how the supercharger is performing, so it can’t optimize performance.
However, with a turbocharged engine, it might cut the turbo off completely, which will cause a significant drop in engine performance.
In some rare cases, it can also increase the turbo pressure which can cause the performance to increase. This can be fatal for your engine so you do absolutely want to address this issue as fast as possible.
3. Lack or Increase of Boost
As we discussed in the previous symptoms section, a faulty boost pressure sensor can cause the engine performance to increase or decrease. This is caused by an increased or decreased turbo pressure.
Some car models do actually have a turbo pressure gauge which you can read the current turbo pressure. If you see that the pressure is lower or higher than usual on higher loads, it can absolutely be caused by a bad boost pressure sensor.
What is a Boost Pressure Sensor?
Your vehicle’s boost pressure sensor tells the ECM how much boost the turbocharger or supercharger is actually producing. While the ECM requests a specific amount of boost, it needs to measure the result of its request.
That’s where the boost pressure sensor comes in. This lets the ECM know what’s actually happening so it can optimize the fuel-to-air ratio for optimal performance. Moreover, it acts as a way to protect the rest of the engine if the supercharger or turbocharger stops functioning the way it’s supposed to.
Boost Pressure Sensor Location
Your vehicle’s boost pressure sensor is usually located on the boost pipes between the intake manifold and the turbocharger. It can also be located on the intake manifold on some car models.
This area allows it to record the amount of boost that the supercharger or turbocharger is creating without getting in the way of anything.
While this is a fairly straightforward location near the top of the engine, you might need to remove a few components to gain access to it. However, when it comes to finding and accessing the boost pressure sensor, it’s one of the easier components on most vehicles.
Boost Pressure Sensor Replacement Cost
The average cost to replace a boost pressure sensor ranges from $175 to $200. However, this cost can vary depending on what kind of vehicle you drive and where you take it for repairs. If you’re looking to replace this sensor yourself to save a little money you can, but most of the cost is in parts not labor.
The average boost pressure sensor costs over $125. But while you’re not going to save a ton of money, replacing the boost pressure sensor yourself is typically fairly straightforward. All you need to do is disconnect the battery, then unplug the electrical connector and remove the bolt holding the sensor on.
From there, bolt the new sensor in, plug it in, and reconnect the battery! If the boost pressure sensor was the problem you should be good to go now.
Can You Drive With a Faulty Boost Pressure Sensor?
You should never drive with a faulty boost pressure sensor. Without a boost pressure sensor, it’s quite common for the ECM to direct too much power to the turbocharger, which can have catastrophic consequences for your engine.
By ignoring a sensor that would cost you under $200 to replace, you can quickly cause several thousand dollars in damages, and you might end up totaling your entire engine. That’s because too much boost can cause your engine to overheat, which can damage various components.
If you don’t have the money to replace your boost pressure sensor right away, it’s better to leave the vehicle in the garage until you can repair it. It might be a major inconvenience, but it’s not worth the risk.
Hi, I’m Magnus, the owner and the writer of Mechanic Base. I have been working with cars for 10 years, specialized in diagnostics and troubleshooting. I created this blog because I was tired of finding false information on the web while looking for repair information. I hope you enjoy my content!