Q: Truck runs really rough, smells like antifreeze in the cabin, testing said it was O2 sensor, and there is an overheating, hissing noise

asked by on

Runs rough, testing said o2 sensor, but , which one? cabin smells like antifreeze, also overheated for the first time, there is some kind of hissing on the passenger side, like a hose? But can't find out where? And the last 2 days the heat won't get warm? Thermostat or could it be o2? Or both?

My car has 193000 miles.
My car has an automatic transmission.

Hello. You can possibly rent a cooling system pressure tester from a local chain auto parts store. With the engine off, remove the radiator cap and pump the cooling system to no more than 10 psi. You will be able to search around the engine compartment and find where the coolant is coming out. You stated that, "Testing said O2 sensor," if this was found out with a scan tool, then it should indicate that there is something wrong with O2 sensor and the sensor will either need to be replaced or the circuit checked for any faults. If you need further diagnosis of the rough running to verify the fault, a certified professional from YourMechanic can come to your home or office to inspect the car and proceed with repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Truck runs really rough, smells like antifreeze in the cabin, testing said it was O2 sensor, and there is an overheating, hissing noise

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car window stuck

The most common failure is the window motor and regulator. I recommend having it checked to see what failed and a window motor and regulator replaced as an assembly is the most common repair. I recommend you have a mechanic...

Q: Car makes one click and won't start

Generally, this type of clicking sound will be heard when the starter solenoid is bad or the battery is simply just too weak to turn the motor over to start. Since you just replaced the starter, it is likely that...

Q: Trouble code P0060 after changing out all of my O2 sensors

Hello. Code P0060 comes on when the computer detects excessive resistance in the heater circuit for oxygen sensor 2, of bank 2. If all of the sensors have been replaced then it may be possible that the issue is rooted...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...