BMW DTC P1346 – Misfire During Start Cylinder 3
DTC P1346 meaning on BMW
DTC P1346 on a BMW indicates a misfire during start in cylinder 3. This means that the engine control module (ECM) has detected a misfire specifically occurring during the engine start-up process in the third cylinder of the engine.
BMW DTC P1346 symptoms
Symptoms of DTC P1346 in a BMW may include rough idling, engine hesitation or stumbling during start-up, decreased engine performance, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P1346 causes
The common causes of DTC P1346 in a BMW include faulty ignition coils, spark plugs, fuel injectors, wiring issues, or a problem with the engine control module (ECM). Additionally, low fuel pressure or a vacuum leak can also contribute to this fault code.
BMW DTC P1346 seriousness
While DTC P1346 may not always lead to immediate engine failure, it is important to address this issue promptly to prevent potential damage to the catalytic converter and other engine components. Ignoring this fault code can result in decreased fuel efficiency and overall engine performance.
How to diagnose DTC P1346 on BMW
To diagnose DTC P1346 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then perform a visual inspection of the ignition system components, such as the ignition coils, spark plugs, and wiring. Additionally, conducting a fuel pressure test and checking for vacuum leaks can help pinpoint the root cause of the misfire.
How to fix DTC P1346 on BMW
Fixing DTC P1346 on a BMW involves addressing the underlying cause of the misfire. This may include replacing faulty ignition coils, spark plugs, or fuel injectors, repairing any damaged wiring, or addressing issues with the ECM. It is important to follow the manufacturer’s recommended diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P1346 on BMW
Once the underlying issue causing DTC P1346 has been resolved, the fault code can be cleared from the ECM using a diagnostic scanner. This process typically involves accessing the ECM through the scanner and selecting the option to clear the fault codes. After clearing the code, it is recommended to test drive the vehicle to ensure that the issue has been successfully resolved.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.