Service Engine soon light Code P0150

Hi,

The code could indicate a faulty sensor, but there are other things as well that could cause it. Has the sensor been replaced 3 times already?

If it has, then the concern is likely due to a wiring issue.

Let me know if the engine is running properly and if I am correct that the sensor has been replaced three times. If it has, I need to know if a universal sensor was used. You may have to look back at the receipts.

Take care,

Joe

Good morning, Joe,

Thanks for your quick response.
The 02 sensor has never been replaced, at least since I have owned the vehicle (2013).
As I explained in my question, the SES light appears and later disappears. This has happened 3 times. Each time the light goes off just before I take it to the garage to have the 02 sensor replaced. I took it to the garage this past Tuesday (7/5/2022) to have it replaced but the technician was concerned that I may have underlying conditions and wanted me to take it to the dealer to determine the cause. Taking it to the dealer can be expensive, which I would like to avoid if possible.
I await your response.
Gil

Hi,

It could have a wiring issue, but the first thing to do would be to watch how the sensor is reacting using a scan tool. The code is usually set when the powertrain control module doesn't receive activity from the sensor. Under normal conditions, the heated O2 sensor would vary voltage between 0.1v and .09v. If it goes outside that range, it sets the code.

There are a few things that can cause this to set. The most common is a bad sensor, which I suspect is the issue with your vehicle. A poor connection, a short in the wiring, and even an exhaust leak at the exhaust manifold. Also, at the present mileage, it really isn't too hard to believe the sensor has worn out. LOL

I would suggest you do it yourself, but there is one issue. The sensor will be on the side of the firewall which makes it a little more difficult to replace. It is mounted in the exhaust manifold (see pic 1 below). To replace it, all you need to do is disconnect the electrical connector, and then loosen and screw out the old and install the new. It requires a special type of socket to accommodate the wiring, but most parts stores will lend you one.

In this case, I would replace the sensor and simply make sure the connector is in good condition. If you want to try it yourself, you could likely do it. I'm here to help if you have questions.

Let me know.

Joe

See pic below.