Q: Code said cylinder 1 misfire, cylinder 2 misfire, o2 sensor misfire?

asked by on

Engine light came on, idling was not smooth. Took it to o'reily to get the code. Said cylinder 1&2 misfiring. They said it was still safe to drive. Honda said the same thing. On the way home, about 7 miles from home, engine light was flashing and my speed was dropping. I pulled over and turn it off. Tried calling people and couldn't get a hold of anyone. So I started it back up and could get the speed back up, but the engine light was still flashing. I am home now and my question is, without obviously you being able to look at it, could it still be just a coil issue, or is it worse?

My car has 104000 miles.
My car has a manual transmission.

Without checking the ignition coils and spark plugs myself for proper spark output I would say the engine is misfiring and may be the coils and plugs. It is also common for the valve cover gasket to leak oil into the spark plug tubes shorting the coil and spark plug out so it cannot fire. The check engine light is flashing due to the misfire is active and additional catalyst damage can happen if you keep driving with the misfire and raw fuel dumping into the catalyst. I would recommend having a mobile mechanic like one from YourMechanic come and do a through diagnosis to see if the valve gasket is leaking into the spark plugs and caused damage to the coils and spark plugs. If it is leaking then the valve cover gasket should be replaced with the spark plugs and contaminated ignition coils replaced then computer codes an be cleared and the vehicle road tested for any other problems from driving the vehicle with the engine misfiring.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Code said cylinder 1 misfire, cylinder 2 misfire, o2 sensor misfire?

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: What does the High Temperature indicator mean on the dash?

Your car’s engine creates a lot of heat during operation. Coolant is cycled throughout the engine to help prevent damage from that heat. If the High Temperature indicator on the dash comes on, it means that the computer has detected...

Q: Q: Engine misfiring.

Although this is a common issue on this generation of the Lincoln LS model, engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination...

Q: Misfire - 2003 BMW 320i

Hi there. Typically when a professional mechanic is trying to diagnose an engine misfire, the first thing they'll do is download any OBD-II error codes to pinpoint the source of the ignition issue. Without knowing those codes, telling you what...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...