Q: Code p0140 we replaced 02 sensor and catalatyic converter
We replaced the catalatyic converter and the back 02 sensor and we checked the wiring for 12 v it's all good
My car has an automatic transmission.
Recommended Services
| Check Engine Light is on Inspection | $94.99 - $114.99 | Get a Quote |
The vehicle should have an original equipment HO2S not aftermarket generic. For a P0140 code, the wiring harness should be closely inspected for damage: chafing, pinches, melting, or water intrusion into connector. Exhaust leaks upstream of the HO2S must be eliminated as that can also cause this DTC. After all other possibilities have been eliminated, the PCM may turn out to be the root cause. An experienced mechanic performing scan tool diagnostics would be recommended at this point. A technician from YourMechanic can come to your home of office to thoroughly diagnose your Check Engine Light and make the correct repairs.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
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
What others are asking
Can you operate safely with the trunk lid open?
Having the trunk open while the engine is running is not a wise idea, although it may be necessary in some instances. Your car’s exhaust contains carbon monoxide, which is toxic and cannot be seen or smelled. If the trunk...
I have an engine vibration that starts when I am in idle.
The engine vibration will need to be checked to see if it is worse in drive than it is in reverse. If the vibration is less apparent in reverse, then the motor mounts will need to be neutralized to center...
Cruise control quit working
Thanks for writing in about your 1998 Chevrolet C1500 Suburban. I would want to diagnose the brake pedal switch (https://www.yourmechanic.com/services/brake-light-switch-replacement) first so I wouldn't replace one that is working fine. A technician using scan tool will easily be able to...
Discoloration in paint work
You will need to take the car to a body and paint repair shop or the dealer to let them have a look at the damaged paint. It sounds like something was on the car that damaged the paint while...
Fuel is leaking and Check Engine Light is on - 2008 Mazda 3
The fuel pump is contained within the tank and so cannot leak. You are probably seeing fuel leaking from a fuel line and/or from the fuel tank itself. There could be a loose fuel line fitting, impact damage (debris from...
How long does it take to change out an oil pan gasket on a 2004 chevy blazer? Why is it so expensive when the gasket is vheap part
Hello. The procedure for this vehicle could be considered labor intensive in comparison to other vehicles. Replacing an oil pan gasket for your vehicle requires that the transmission be separated from the engine in order to remove and install a...
cylinder 3 misfire evap large leak
Hi there. Among the error codes you listed, the concerning one is P0045 (https://www.yourmechanic.com/article/p0455-obd-ii-trouble-code-system-gross-leak-evaporative-emission-by-john-nelson), which indicates a leak in the EVAP system exists. The leak can be caused from a variety of components. The most common is related to the...
My car rpm is going up and down and my speed meter is too. i have an Chevrolet 2012 cruze. what could it be?
What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital...
My 2013 chevy captiva had the reduced engine power light come on while i was at a stop light.
Hi Daniel. Thanks for contacting us tonight. It's quite possible that these two warning lights - along with the 20 mph performance are caused by the same component - a damaged speed sensor. The reason your car is only going...
Related articles
The Best Used Cars to Buy for Occasional Drivers
Not Not everyone relies on their car on a daily basis. Maybe you aren’t the type that deals with a daily commute, and running from here to there constantly. If that’s the case, you may be looking for a car...
Pontiac Certified Pre-Owned (CPO) Car Program
If If you’re in the market for a used Pontiac vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
How to Buy a Classic Pontiac
Whether you want to buy a classic Pontiac for yourself or as a gift, here are some tips on buying one for a great value.
Browse other content
Maintenance
Services