Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Condition For Fault Memory Entry - Miss Within 4 Diagnosis Windows
2006 BMW X5 (E53) V8-4.8L (N62)SECTION Condition For Fault Memory Entry - Miss Within 4 Diagnosis Windows
29D3 - P0307
Information saved in
DME
Fault code
29D3 - P0307
Fault text
Combustion misfires, cylinder 7
Fault description
Cylinder 7 Misfire Detected
Condition for fault identification
Test condition:
Combustion consistency measurement. Starting at engine
speed n > 400 and n < 6400
Terminal condition: Terminal 15, engine on
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
Combustion miss detected within four diagnosis windows
consisting of 1000 crankshaft rotations
Action in service
Visual inspection of spark plugs, ignition coils, if OK switch
positions -> If defect moves with parts, replace defective
components, check ignition cables, wiring harness;
check injector valve, fuel system incl. high-pressure pump
(fuel level ?)
Visual inspection of catalytic system for damage (unusual
colors on catalytic converter casing, check monolithic
structure with endoscope)
Fault code entries triggered by faults in Valvetronic system
Valvetrain - HVA - Check elements for damage (broken
springs, mechanical damage)
Check compression (with max. stroke) After running all
checks with no defects detected, replace DME-SG
Fault effect and breakdown warning
Driver information
Warning light:
MIL flashes immediately
Service instruction
none
Information saved in
DME
Fault code
29D3 - P0307
Fault text
Combustion misfires, cylinder 7
Fault description
Cylinder 7 Misfire Detected
Condition for fault identification
Test condition:
Combustion consistency measurement. Starting at engine
speed n > 400 and n < 6400
Terminal condition: Terminal 15, engine on
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
Combustion miss detected within four diagnosis windows
consisting of 1000 crankshaft rotations
Action in service
Visual inspection of spark plugs, ignition coils, if OK switch
positions -> If defect moves with parts, replace defective
components, check ignition cables, wiring harness;
check injector valve, fuel system incl. high-pressure pump
(fuel level ?)
Visual inspection of catalytic system for damage (unusual
colors on catalytic converter casing, check monolithic
structure with endoscope)
Fault code entries triggered by faults in Valvetronic system
Valvetrain - HVA - Check elements for damage (broken
springs, mechanical damage)
Check compression (with max. stroke) After running all
checks with no defects detected, replace DME-SG
Fault effect and breakdown warning
Driver information
Warning light:
MIL flashes immediately
Service instruction
none
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.