Q: My car is idling rough

asked by on January 21, 2016

My car is idling rough, and I am getting error codes p0140, p2195. I recently replaced the spark plugs, ignition coils, and valve cover gaskets. I suspected a vacuum leak, so I added a hose clamp to the rear hose and cleaned the throttle body. I might have frayed a wire or connection putting pieces back together.

Car idle is rough Inspection $79.99 - $99.99 Get a Quote

It is a possibility that the engine performance issues may have been caused by a problem when it putting the pieces back together, however, the trouble codes seem to point to different issues. Both codes are related to the oxygen sensors on bank 1 of the engine. P0140 indicates no sensor activity for oxygen sensor 1 on bank 1, and P2195 indicates a biased, or stuck, signal from oxygen sensor 2 of bank 1. Oxygen sensors are sometimes located in hard to reach areas and usually require special tools and equipment to service. I would recommend having the idling issue inspected by a knowledgable technician, such as one from YourMechanic.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

I can’t unlock my car dead battery and key won’t unlock doors to get into the hood

My 1996 ford tarus started smoking and the making a knocking noise when i press the gas

Engine knocks can mean serious business, and at 220 thousand miles it could be just about anything. It could be that you have internal engine damage. Before you drive the car any more, you should have t checked out to...

My front wheels are locked when I switched to four wheel drive.

If your transfer case can switch from 2 HI, 4 Hi, and 4 LOW, then there is nothing wrong with the transfer case. There seems to be an issue with the front locking solenoid and it may be stuck in...

Car wont start. 2011 BMW 328xi

Hi - this "stalling and won't restart" problem could have several causes, so extracting the problem codes that turned on the "!" indicator is the first step. A failing fuel pump (fuse, relay or the pump itself), or a crankshaft...

318 Won't start. How do you know when a cam is 180 degrees out?

Hey there. If you bring the number one cylinder up on its compression stroke and crankshaft set to top dead center, then take off the distributor cap to see if the distributor rotor is pointing to number one cylinder on...

Engine light and TC light on at same time

Hi there: It's possible that you have a few electrical gremlins along with the wheel bearing issue. The traction control light will be triggered when a sensor detects an issue with one of the many mechanical components that operates the...

Car is misfiring, oil in ignition coil & spark plug

Soak up the oil in the hole and clean it out with brake cleaner. Then dry it before replacing the spark plugs and ignition coils. You should replace all 4 coils as a set with new plug wire boots and...

What does the speed control indicator mean?

The speed control indicator is located on the instrument panel. When the light illuminates gray, then the speed control system is currently turned on. When the light illuminates green, then the speed control system is currently in use.

What does the low tire pressure Warning Light mean?

The low tire pressure Warning Light is located on the instrument panel. This light illuminates when one of your tires is not inflated to the proper air pressure. Driving with an underinflated tire can be very dangerous, so stop as...

Related articles

How Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
How Does a Starter Motor Work?
When you turn the key in your car’s ignition, the engine turns over and then cranks. However, getting it to crank...
How a Keyless Push-Button Ignition Works
Technology Technology has advanced for automotive security and user-focused features, and a shift is occurring where traditional key-and-cylinder starting systems are being replaced by keyless push-button ignition systems. They are incredibly simple to operate and provide excellent security. The system...