Codes P0453, P0155 and P0453, sputtering, rough idle and poor gas mileage?

KASHAYLA BOSTEDER

MEMBER
2007 CADILLAC CTS
3.6L
V6
2WD
AUTOMATIC
220,000 MILES

I’ll explain them in order I found them.

1. I’ve got codes for p0453 twice, p0155 twice and p0453 also twice. OBD reader suggested the p0453 is the “most likely solution”.

I went and had my Cadillac tested because of the puttering, rough idle and poor gas mileage. All of this started after I put $40.00 in my fuel tank from Walmart. After getting my results I went and bought a new fuel cap. Still running ragged and even died once on me and haven’t drove it since. Today I went and opened the door and noticed the dash lights did not light up. So, I put my key in the ignition to see if it would start and now the key is stuck in the ignition and also the car wasn’t properly put in park. I read on here there is an ignition reset button somewhere in the steering wheel column but I don’t see it.

Help please!

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Monday, June 2nd, 2025 AT 7:49 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

It seems like you have three or four different issues. If the battery is dead, then the ignition system (key) with not work right so this is where I would start. I would turn the headlights on to see if there are bright, please go over this guide to help:

https://www.2carpros.com/articles/car-battery-load-test

You can also remove the battery and take it to the auto parts store, and they can test it. I have included how to remove the battery in the images below. These codes will not have anything to do with the park or not starting issue so please start new threads for each.

P0453 - Evaporative Emission Control System Pressure Sensor High Input

P0155 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

Check out the images (below). Please let us know what happens.

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