P0307 OBD-II Trouble Code: Cylinder 7 Misfire Detected

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0307 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0307 code

P0307 is a diagnostic trouble code (DTC) for "Cylinder 7 Misfire Detected". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0307 DIAGNOSTIC Get a fair and transparent estimate upfront

P0207 code definition

Cylinder 7 Misfire Detected

What the P0207 code means

When the P0207 diagnostic trouble code is stored by the Powertrain Control Module (PCM), it is an indication that a misfire has been detected in cylinder 7. More specifically, the PCM detects an increase or decrease in crankshaft revolutions per minute (RPM) that exceeds 2%.

A quick background into this system:

Each cylinder is connected to the crankshaft. On top of each cylinder is a spark plug, which uses a flammable fuel/air mixture that has been compressed inside the cylinder to fire a spark and set fire to the fuel. The fuel then releases energy to power the crankshaft. If the cylinders are not firing properly, there will be an increase or decrease in the crankshaft RPM.

What causes the P0207 code?

  • Faulty spark plug in cylinder 7
  • No compression in cylinder 7
  • Damaged or worn out spark plug wires
  • Damaged or worn spark plug coils
  • Damaged distributor cap (does not apply to all vehicles)
  • Damaged rotor button (does not apply to all vehicles)
  • Faulty fuel injector
  • Clogged exhaust gas recirculation (EGR) valves or tubes
  • Burned valves
  • Inaccurate ignition timing
  • Vacuum leaks
  • Low fuel pressure
  • Head gasket leaks
  • Cracked distributor cap
  • Faulty camshaft sensor
  • Faulty crankshaft sensor
  • Faulty mass air flow (MAF) sensor
  • Faulty oxygen (O2) sensor
  • Faulty throttle position sensor
  • Faulty catalytic converter
  • Faulty PCM

What are the symptoms of the P0207 code?

  • Check Engine Light that is on or flashing (dependant on severity of misfire condition)*
  • Vehicle that is difficult to start or will not start at all
  • Vehicles stalls during acceleration
  • Vehicle randomly stalls or dies at stops
  • Vehicle engine runs rough
  • Vehicle idles rough
  • Vehicle lacks power while driving
  • Increase of fuel consumption
  • Vehicle has no symptoms (rare)

*If the increase or decrease in crankshaft RPM is between 2-10%, the Check Engine Light will illuminate and remain steady. However, if the crankshaft RPM exceeds 10%, the Check Engine Light will illuminate and blink continuously. A variation of more than 10% in crankshaft RPM indicates a serious misfiring condition.

How does a mechanic diagnose the P0207 code?

  • Uses an OBD-II scanner to get all of the trouble codes and freeze frame data that has been stored by the PCM

  • Clears codes, then performs a test drive to see if code P0207 returns

  • Inspects the spark plug wire for cylinder 7 for wiring that is damaged or worn out

  • Inspects the spark plug for cylinder 7 for damaged or excessive wear

  • Inspects coil packs and coil pack wiring for corrosion, breaks, excessive wear, or other damage

  • Inspects the distributor cap and rotor button for corrosion, cracks, excessive wear, or other damage (if vehicle has distributor cap and rotor button system)

  • Replaces or repairs damaged spark plugs, coil packs, spark plug wiring, and/or coil pack wiring

  • Inspects the fuel injectors and fuel injector wiring if the P0207 code returns after any damaged spark plugs, coil packs, spark plug wires, and/or coil pack wiring has been replaced

  • Diagnoses and repairs any other trouble codes and performs another test drive to see if the P0207 code returns

  • If the P0207 code returns, inspects the compression system for cylinder 7

If clearing the P0207 diagnostic trouble code fails, the PCM may need to be replaced or reprogrammed. This is not common, but should be considered as a possibility when other diagnostic measures have not resolved the misfire condition.

Common mistakes when diagnosing the P0207 code

A common mistake is neglecting to rule out all of the possible causes for the misfire condition.

Visually inspect the fuel injector wiring before replacing spark plugs, spark plug wiring, coil packs, and coil pack wiring. In addition to ruling out the a faulty cylinder, other related stored trouble codes will need to be diagnosed and repaired. Taking time to address the other possible causes of the misfiring condition during the diagnostic process may save a lot of time.

How serious is the P0207 code?

A vehicle with a misfiring condition could shut down completely, or not start at all. These driveability issues make operation of a vehicle unreliable and hazardous. For this reason, the P0207 diagnostic trouble code is one that is considered serious. This condition should be addressed and repaired as soon as possible.

What repairs can fix the P0207 code?

Additional comments for consideration regarding the P0207 code

If one of the spark plugs is damaged and needs to be replaced, it will be necessary to replace all of the spark plugs. A good way to determine if a defective wire or coil pack is causing the misfire is to switch the wire and/or coil pack with another wire and/or coil pack. If a new trouble code comes back for a different cylinder, it is an indication that the misfiring condition is being caused by the wire and/or coil pack. It may also be possible that the vehicle is in need of a tune-up.

It is also necessary to gap the spark plugs properly, as not doing so can cause a misfiring condition. To gap the spark plugs correctly, a feeler gauge will be required. Manufacturer specifications should be used when gapping the spark plugs. These specifications can be found on a sticker, under the hood of the vehicle.

Need help with a P0207 code?

YourMechanic offers certified mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

trouble codes
P0307
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0307 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,829

Rating Summary
4,442
187
48
28
124
4,442
187
48
28
124

Walter

44 years of experience
64 reviews
Walter
44 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Tulsa, Oklahoma
Went above and beyond my expectations, as i was very nervous about this type of service! But to my surprise, I am absolutely satisfied with the service ! Would recommend 100X to all i know! Thanks for the care and information and time you put in to my qoute and truck@

Keith

16 years of experience
279 reviews
Keith
16 years of experience
BMW 535i xDrive - Check Engine Light is on - Kissimmee, Florida
Very personable, knowledgeable person, who provided information on my car that I was not aware of. The overall experience was great and I would definitely refer this company to my family and friends.

Luis

13 years of experience
20 reviews
Luis
13 years of experience
Audi A3 - Check Engine Light is on - Van Nuys, California
Luis was awesome. Very knowledgeable and a down to earth person. Would highly recommend and plan on using him in the future for any repair that I need!

Joel

19 years of experience
742 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

More related articles

P0226 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem
P0226 P0226 code definition Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem What the P0226 code means P0226 is a generic OBD-II code which indicates that the throttle/pedal position sensor/switch C circuit has a range or performance problem causing the sensor...
P0006 OBD-II Trouble Code: Fuel Shutoff Valve "A" Control Low
P0006 P0006 code definition The P0006 code is associated with an electrical circuit which connects from your engine computer to your fuel system and is most commonly found on diesel engines. It also may be related to other codes,...
P0322 OBD-II Trouble Code: Ignition/Distributor Engine Speed Input Circuit No Signal
P0322 means the PCM received an unusual input signal from the distributor or crankshaft position sensor, due to their misalignment

Related questions

Reduced Engine Power message

The "Reduced Engine Power" message is the computer going into failure mode. This mode is to protect you from a possible problem of the throttle getting too high. The mode happens when one of the engine sensors is having a...

Need to know if I should replace my turbo or not

Hi, thanks for writing in. The turbo system is comprised of several different components. Without knowing the exact trouble code, it would be hard to guess at what is going on. There could be a bad sensor, a leaking intake...

Crankshaft and camshaft position sensor circuit malfunction

The 335 and 340 codes are for crankshaft and camshaft circuits. This could be bad sensors, or it could be an issue in the wiring to the sensors. The 421 is for a catalyst performance. It can come up because...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com