P1348 MINI Code - Misfire During Start Cylinder 4
Quick Answer
As part of the CARB/OBD regulations, the Engine Control Module (ECM) must determine if a misfire is occurring and also identify the specific cylinder(s) and the severity of the misfire event and whether it is emissions relevant or catalyst damaging. Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1348 MINI indicates Misfire During Start Cylinder 4.
- Common causes
- Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1348 MINI Description
The misfire/engine roughness calculation is derived from the differences in the period duration (T) of individual increment gear segments. Each segment period consists of an angular range of 120° crank angle that starts 78° before Top Dead Center (TDC).
If the expected period duration is greater than the permissible value a misfire fault for the particular cylinder is stored in the fault memory of the ECM. Depending on the level of misfire rate measured the control unit will illuminate the "Service Engine Soon" light, may cutoff fuel to the particular cylinder and may switch lambda operation to open-loop. All misfire faults are weighted to determine if the misfire is emissions relevant or catalyst damaging.
What are the Possible Causes of the DTC P1348 MINI?
- Faulty Spark Plug
- Faulty Ignition Coil
- Intake vacuum leak
- Faulty Camshaft Position Sensor
- Ignition Coil harness is open or shorted
- Ignition Coil circuit poor electrical connection
How to Fix the DTC P1348 MINI?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1348 MINI code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1348 MINI Code
1. What does the OBDII code P1348 mean on a MINI?
P1348 indicates a misfire in cylinder 4 specifically during startup, often related to ignition or fuel delivery issues.
2. What are common symptoms of the P1348 code on a MINI?
Symptoms include rough starts, engine shaking, loss of power, poor fuel economy, and the check engine light turning on.
3. What causes the P1348 code on a MINI?
Common causes include a faulty ignition coil or spark plug in cylinder 4, fuel injector issues, low compression, or vacuum leaks.
4. Can a dirty fuel injector cause the P1348 code?
Yes, a clogged or malfunctioning fuel injector in cylinder 4 can disrupt fuel delivery and cause a misfire.
5. How can I fix the P1348 code on my MINI?
Start by inspecting and replacing the spark plug or ignition coil for cylinder 4. If the problem persists, check the fuel injector, compression, and for vacuum leaks.
6. Is it safe to drive with the P1348 code active?
Driving with this code is not recommended as it can cause further engine damage or catalytic converter failure over time.
7. How do I diagnose the P1348 code on a MINI?
Use an OBDII scanner to confirm the code, then visually inspect the spark plug, ignition coil, and wiring for cylinder 4. Perform tests on the fuel injector and check engine compression.
8. Can low engine compression cause the P1348 code?
Yes, low compression in cylinder 4 can lead to incomplete combustion and trigger the misfire code during startup.
9. How much does it cost to repair the P1348 code on a MINI?
Repair costs vary but may range from $100 to $300 for spark plug or ignition coil replacement. More complex issues like low compression or injector problems may cost significantly more.
10. Can a vacuum leak trigger the P1348 code on a MINI?
Yes, a vacuum leak affecting cylinder 4 can lead to an air/fuel imbalance and result in a misfire during startup.
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