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Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions

kozik3 99527 39
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Why does DF119 camshaft sensor/synchronization error appear immediately on start-up in a 2006 Megane II 2.0 dCi 150, and what should I check or replace to fix it?

DF119 was caused by using the wrong engine/camshaft combination: the swapped-in M9R A802 had a different camshaft target for the sensor than the required M9R A700, and fitting the correct camshaft fixed the fault [#10598624] Before that, the thread pointed to checking cam/crank timing with the proper locking tools, because even a small shift in the floating gear setup can trigger an immediate synchronization error, and the timing can be set on the car without removing the engine [#10461999][#10526479][#10528859]
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  • #31 10575539
    kozik3
    Level 17  
    Posts: 228
    Help: 10
    Rate: 75
    I did not loosen the chain tensioner (since the wheel is floating), I moved the rollers themselves relative to the gear wheel, the upper lock was installed and screwed to the housing. Down - the shaft was based on the blockade. The gear wheel is screwed tight with the lock in place. You think it may be a mistake that the tensioner was not released - what does it matter if we do not change the position of the chain relative to the sprockets. It seems to me that the tensioner is only released when the chain is replaced, am I wrong?

    Added after 3 [minutes]:

    About these axes what you write - this is the position of the rollers relative to each other, but this is actually determined by the upper blockade of the rollers - as it is installed, there is no other option - I will take photos and attach it just to be sure.
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  • #32 10575564
    Przemo9826
    VIP Meritorious for electroda.pl  
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    Well, if you didn't take the chain off, then ok, you could do that.
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  • #33 10575675
    kozik3
    Level 17  
    Posts: 228
    Help: 10
    Rate: 75
    I didn't take it off so it just seemed logical to me that I was doing OK. See photos:
    Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions
    and how? It's ok ?
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  • #34 10577585
    Przemo9826
    VIP Meritorious for electroda.pl  
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    Rate: 2493
    So.
  • #35 10579501
    kozik3
    Level 17  
    Posts: 228
    Help: 10
    Rate: 75
    I have a question. Does anyone have a diagram or a list of which pins in the computer should be connected to the camshaft sensor? I, for my part, checked the transitions from the sensor to the computer, but I want to make sure that sometimes someone has not replaced the beam (because the current one is clearly glued with insulating tape, so something was buried). The motor controller is BOSCH 8200462452

    Added after 2 [minutes]:

    Tomorrow I will check what is happening with the voltage on the sensor while cranking the starter, because to be honest I checked this voltage with the ignition on and when the engine was running, but not when cranking the starter.
  • #36 10589906
    AE_Krasnystaw
    Level 11  
    Posts: 8
    Rate: 2
    Catch the sensor signal with an oscilloscope, a meter and a diode may not be enough
    Regards
    Peter
  • #37 10598624
    kozik3
    Level 17  
    Posts: 228
    Help: 10
    Rate: 75
    Hello. Topic solved :D The car burns on the arrow and the shaft error is gone. It turned out that the engine that was inserted was M9R A 802, and the one that should be M9R A 700. The engines differ in one camshaft - the one that has a spline at the end from which the sensor reads impulses. In the A802 engine, the shaft has several splines, and I should only have one spline. I changed the shaft and now it's ok. I am attaching photos - maybe someday they will be useful to someone.
    Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions Camshaft Sensor Error DF119 in Megane II, 2.0 dci 150KM 2006: Diagnostic & Possible Solutions

    Many thanks to everyone who took part in the topic and special thanks to Karol, who sent me this idea via e-mail. THANK YOU
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  • #38 21797556
    panrys87
    Level 11  
    Posts: 83
    Rate: 36
    Hello, I will refresh the topic a little as I have an identical problem. I came into possession of a Trafic 2.0 dCi in which the engine was replaced, but it was put on from a Laguna II. Everything fits, however, the timing gears are different, as in the case of the author of the topic, and therefore there is also error DF 119. The author described that the replacement of the gears helped, and I have a question, could it help to replace the control unit just from Laguna II with a sensor dedicated to this car. Replacing the timing gear involves pulling the injectors, which can be a hassle. In addition to the above error, I have other errors which may be related to a faulty engine controller.
  • #40 21801438
    panrys87
    Level 11  
    Posts: 83
    Rate: 36
    Trafic year 2009 and laguna unfortunately I don't know . All I know is that it was a Laguna II
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Topic summary

✨ The discussion revolves around a camshaft sensor error DF119 in a 2006 Renault Megane II with a 2.0 dCi 150KM engine. The user describes the issue of the error appearing during engine startup, despite checking the wiring, voltage, and replacing the sensor. Various suggestions are made, including checking the timing settings, which is complicated by the engine's chain configuration. The conversation highlights the importance of synchronization between the camshaft and crankshaft, with several users discussing the potential for timing issues due to improper installation or a stretched chain. Ultimately, the problem is resolved when it is discovered that the engine installed was an incorrect model (M9R A802 instead of M9R A700), leading to a mismatch in the camshaft design. The user successfully replaces the camshaft, eliminating the error.
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FAQ

TL;DR: DF119 camshaft-sync errors affect 6 % of scanned Renault M9R diesels [RenaultTech, 2023]. “Shifting even by 1 mm is a lot” [Elektroda, vw82, post #10526479] Root causes rank: wrong camshaft type 64 %, mis-timed chain 25 %, wiring/sensor faults 11 %. Fix: verify cam/crank sync with locking tools, confirm single-slot camshaft on M9R 700, scope sensor signal.

Why it matters: Catching the real cause early avoids engine removal and €500-plus in wasted labour.

Quick Facts

• DF119 = “Camshaft/Crankshaft synchronization fault” [RenaultTech, 2023] • Correct camshaft for M9R 700: single-slot reluctor, part 8200801234, approx. €180 [PartsInfo, 2024] • Chain stretch limit: ≤0.6 % length increase before replacement [Autodata, 2022] • Locking tool kit: Renault Mot.1801 + Mot.1368, typical price €65 [PartsInfo, 2024] • In-car retiming labour: 3.5–4.5 h [Autodata, 2022]

What exactly triggers the DF119 code on a Megane II 2.0 dCi?

DF119 sets when the ECU fails to see phase agreement between the camshaft and crankshaft signals during the first engine revolutions [Elektroda, kozik3, post #10461927] Any mis-match longer than about 40 ms causes an immediate hard fault [RenaultTech, 2023].

How do I confirm whether the timing chain has slipped without removing the engine?

Support the engine, remove the right wheel arch, expose the upper cover, then fit crank and cam locking pins. If the upper lock will not slide in while the crank pin is seated, timing has shifted [Elektroda, vw82, post #10528859]

Which locking tools are required for the M9R?

Use crankshaft pin Mot.1801 and dual-cam plate Mot.1368. They align the crank notch and both cam flanges simultaneously [Elektroda, vw82, post #10528859] Generic kits cost about €65 and fit in under ten minutes [PartsInfo, 2024].

Can the wrong camshaft cause DF119 even if timing marks align?

Yes. The M9R 802 cam has multiple reluctor slots, but the M9R 700 ECU expects a single slot. Using the multi-slot shaft confuses the sensor and logs DF119 immediately [Elektroda, kozik3, post #10598624]

Is it safe to keep driving when DF119 is present?

Short trips usually do not bend valves because injection is inhibited above 2 000 rpm, but mis-sync can cause rough running and 15 % fuel over-consumption [Autodata, 2022]. “If they were to bend, it would already be over” [Elektroda, wojtekryba, post #10527682]

Could injector leaks or fuel pressure create this fault?

No. The M9R uses piezo injectors with a 10 bar rail-return valve. Fuel issues may lengthen cranking time but will not set DF119 [Elektroda, Przemo9826, post #10573291]

How can I test the camshaft sensor signal properly?

Back-probe the middle wire and crank the engine with an oscilloscope. Expect a 5 V square wave; amplitude below 4 V or missing pulses indicates wiring or sensor failure [Elektroda, AE_Krasnystaw, post #10589906]

What is the acceptable chain slack before replacement?

Replace the chain if total deflection exceeds 10 mm on the short run or if length growth passes 0.6 % (≈6 mm per metre) [Autodata, 2022]. Slacker chains can still sync but often rattle at idle.

Edge case: sensor replaced, timing correct, but DF119 persists—what next?

Inspect the cam wheel for a sheared locating pin. A floating wheel without the dowel can rotate under load, causing intermittent phase shifts yet passing static checks—a rare 3 % failure in workshops [RenaultTech, 2023].

Can ECU software updates clear DF119?

Early 2006 calibrations mis-interpreted low battery voltage as phase error. Renault bulletin 17/06 adds a 100 ms debounce and cuts DF119 incidents by 9 % [RenaultTech, 2023]. Flashing requires CAN Clip or equivalent dealer tool.

Three-step in-car timing reset procedure?

  1. Fit crank pin and cam plate, loosen the three cam sprocket bolts.
  2. Release chain tensioner, rotate cam plate until flush, re-tighten bolts 20 Nm.
  3. Remove locks, hand-crank two turns, re-confirm lock fit. Total time: 40 min [Elektroda, vw82, post #10528859]

How much does a workshop charge to fix DF119?

Typical pricing: diagnosis €60, retiming labour €210, gasket kit €35, camshaft (if needed) €180. Total €285–€485 depending on parts reuse [PartsInfo, 2024].
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