Skip the auto shop - Our mechanics make house calls

Q: Miss fire cylinder #1, bank 1 sensor 2 codes

asked by on

My Jeep just started to loose power when I was getting onto the freeway the other day. Would not drive over 40 mph and sputtered and backfired a few time before shutting the motor off. Check engine light flashed and threw two codes, miss fire in cylinder #1 and bank 1 sensor 2. Could I have a bad cat, injector which is more prevalent? Checked the plug and wires they looked good and now the Jeep runs decent but can tell there something still off and it threw the code again after about 12 miles after being cleared.

My car has 136400 miles.
My car has a manual transmission.

Hi there. Before going after a possible catalytic converter or oxygen sensor bank(1) sensor(2), the misfire needs to be corrected. The check engine light flashing would be ECM (engine control module)/computer recognizing the misfire. The spark plug and spark plug wire appearing okay, does not necessarily mean they are okay. The fuel injector could be at fault. Resistance value tests, using an ohmmeter could help isolate the problem. Comparing the resistance value with known good cylinders would give you an idea, what you should expect to see. Proper diagnoses needs to be performed to avoid unnecessary repairs. I recommend having your vehicle’s #1 cylinder misfire be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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

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: Is it possible to fit a LT4 Supercharged 376ci / 6.2L Engine into a 1997 Z28 Camaro?

When changing the engine over from a Z28 to a LT4 Supercharged 376 CI engine, you may have to adjust the engine mounts to accept the engine transferring over. The blocks are about the same size and will both bolt...

Q: Check gauge light is on and Battery voltage is dropping. The battery is failing to stay fully charged.

Hi there. First the battery will need to be charged to 100% charge of 12.6 volts. Then load test the battery and see if the battery can hold a charge after a load for 30 seconds. If the battery can...

Q: Whining noise getting worse over time when I accelerate but no low fluid

Disconnect all accessories, that is remove the drive belts. If the noise disappears, obviously one of those driven components is the source. If the noise remains, it could be due to a vacuum leak, wheel bearing issue or a problem...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...