Failed needle lift sensor inside the cylinder one injector; Damaged or chafed wiring between the sensor and the engine control module; Corroded or loose electrical connector at the injector; Faulty engine control module, though this is rare; Mechanical wear in the injector affecting the sensor's magnetic pickup; Aftermarket or incorrect injector installed without a compatible sensor

DTC codes / Mercedes-Benz codes / P1352

P1352 · Mercedes-BenzNeedle Lift Sensor

Q: What does code P1352 mean?

Needle Lift Sensor. P1352 on Mercedes-Benz diesel engines indicates that the engine control module has detected an implausible or missing signal from the needle lift sensor, which is integrated into the fuel injector on cylinder one. The sensor reports the exact moment the injector needle opens, allowing the computer to fine-tune injection timing; when the signal is absent or erratic, the module sets this code and typically defaults to a calculated timing value.

P1352 on Mercedes-Benz diesel engines indicates that the engine control module has detected an implausible or missing signal from the needle lift sensor, which is integrated into the fuel injector on cylinder one. The sensor reports the exact moment the injector needle opens, allowing the computer to fine-tune injection timing; when the signal is absent or erratic, the module sets this code and typically defaults to a calculated timing value.

SystemPowertrain

Code typeMercedes-Benz specific

SeverityMedium

Fix difficultyProfessional

AreaIgnition system and misfire

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or intermittent misfire, especially when the engine is cold
Reduced engine power or limp-home mode under acceleration
Increased fuel consumption and black smoke from the exhaust
Hard starting or extended cranking before the engine fires
Slight hesitation or stumble during light-throttle cruising

Common causes, most likely first

Failed needle lift sensor inside the cylinder one injector
Damaged or chafed wiring between the sensor and the engine control module
Corroded or loose electrical connector at the injector
Faulty engine control module, though this is rare
Mechanical wear in the injector affecting the sensor's magnetic pickup
Aftermarket or incorrect injector installed without a compatible sensor

How to diagnose and fix it

Read all stored and pending codes with a Mercedes-compatible scan tool to confirm P1352 is the primary fault
Inspect the injector connector and wiring harness for corrosion, chafing, or loose pins, and repair as needed
Measure the needle lift sensor resistance and compare it to the manufacturer's specification
Check the sensor signal with an oscilloscope while cranking to verify a clean waveform
If the sensor is faulty, replace the cylinder one injector with a genuine or OEM-quality unit
Clear the codes and perform a road test to confirm the repair and ensure the code does not return

Needle lift sensor faults you should not overlook

A failed needle lift sensor often produces no driveability symptoms at all, so the warning light may be the only clue the driver notices.
Wiring damage near the injector is a common cause that is frequently missed because the insulation can look intact while the conductor inside is broken.
The engine control module may substitute a default injection timing value when the sensor signal is lost, which can mask the fault during a short test drive.
Replacing the injector without checking the connector and harness first can lead to a repeat failure if the underlying wiring issue is not addressed.
On some Mercedes diesel engines, a weak battery or poor ground can cause intermittent sensor codes that mimic a failed needle lift sensor.

Can I keep driving with P1352?

You can usually continue driving with P1352, but avoid heavy acceleration and long trips until the fault is diagnosed, because the engine may enter limp-home mode and fuel economy will suffer. If the engine runs roughly or stalls, have the vehicle inspected promptly.

Tools that help

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Guidance is general and written for Mercedes-Benz vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.