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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car won't start; get error code P0340

Let us first start by discussing the OBD code P0340, which indicates a problem with the camshaft sensor in the Celica. On your particular Toyota, the camshaft position sensor is built into the distributor, therefore you are correct to think...

Q: Serpentine belt

Has the crankshaft pulley been checked ? If the crankshaft dampner/pulley has separated or cracked, it can be even the slightest bit out of alignment with the other pulleys. Also, the a/c compressor, alternator, and power steering brackets should be...

Q: ABS light is on

Hi There, This may be an issue of a faulty ABS control module or possibly faulty wheel sensors. The ABS control module controls the activation of the ABS system based upon inputs from the ABS wheel sensors. When this module...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.