Skip the auto shop - Our mechanics make house calls

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.

A: Hello. You can possibly rent a cooling syst...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My catalytic converters need to be replaced

Hi there, thanks for writing in. First of all, removing a catalytic converter is illegal in all 50 states. They are federal emissions items, and there is a very stiff fine for removing or tampering with them on a vehicle...

Q: Bolt underneath engine block is leaking water left side 2001 ranger

I'm not sure what "bolt" you're talking about and you don't say what engine is in your vehicle. My recommendation is to have a professional pressurize the cooling system to pinpoint the exact location of the leak. Allowing the engine...

Q: P0420 code after idle relearn

Hello. P0420 is the code for catalyst efficiency below the correct threshold for bank 1. If you do not believe the catalytic converters are the issue, then the first thing I would do is check the bank 1 oxygen sensors....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...