Q: I have misfires and cylinder 7 is not firing properly. Also the oxygen sensor needs to be replaced or sensors where is that locate

asked by on

I have misfires. It said on the code reader that cylinder 7 is not firing or firing at the correct time which is making me lose power and Shakes when at idle. Also it said it needed a new oxygen sensor or censors where is that exactly

My car has 218000 miles.
My car has an automatic transmission.

Misfiring can cause unburned fuel to enter the catalytic converter where it will light off in the converter, overheating it and melting the catalyst. Therefore, it is recommended that misfiring be repaired promptly. Causes of misfiring range from ignition to fuel system faults but there can be engine damage, such as to the valves, that will cause misfiring. Oxygen sensors should be carefully tested on an automotive scope before they are condemned. Just because an oxygen sensor is identified in a diagnostic trouble code as a "potential" fault does not always mean the sensor itself has failed. Wires to the oxygen sensor can get damaged and/or other problems in the engine can cause the sensor to report values to the PCM that are out of range. Oxygen sensors are installed in the exhaust manifolds and/or exhaust pipe very close to the manifold as well as post-catalytic converter. If you desire that the misfiring problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine misfire diagnostic and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.

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. I have misfires and cylinder 7 is not firing properly. Also the oxygen sensor needs to be replaced or sensors where is that locate

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: I scanned my mercedes ML 250 CDI 4Matic W166 with icarsoft MB 2 scanner. Its showing trouble code U144f00. What does it mean ?

The fault being reported is within a Controller Area Network (CAN) function (wiring or device) but the code itself is generic. According to MB, the particular scanner that you are using will have an accompanying description of the code as...

Q: Car idles rough when stopped at light or stop sign (not all the time). Car overheated very briefly.

Its possible that a bad gasket could be allowing the coolant to cause your misfire. There are many places that coolant can leak and many causes for a misfire like yours. The symptoms you describe may not be related to...

Q: Ignition coil overheating

When electrical components get hot it is typically due to a high level of resistance. The most common issues with the coils getting hot are caused by the spark plugs, wires, or the distributor. You may want to replace...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
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...