KNOWN FAULTS · Dacia

Dacia Logan (II) 1.5 dCi (K9K) common problems.

2012–2020 · Diesel

Sources are not verified in real time and no entry confirms that your car is affected.

6 known faults with sources

Applies if: Only the 1.5 Blue dCi built before 30/9/2019.

Constant whine in the cabin from the 1.5 Blue dCi fuel pumpFuel system

Engine / equipment: 1.5 Blue dCi (K9K) in Dacia models
Period mentioned: 2018–2019
Symptoms: A continuous high-pitched whine inside the car, like a computer fan, that does not change when accelerating.
Possible cause described: According to Dacia's note to its dealers reported by L'argus, the noise comes from the fuel pump, whose tank pump-and-sender module was badly designed. The supplier modified it and the new part has been fitted at the factory since 30/9/2019.
Check for the garage: Check that the noise does not change with engine speed and ask the garage to listen around the fuel tank before replacing the turbo or the fan.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Only with a manual gearbox and built from October 2018 to February 2020.

Creaking when pressing the clutch caused by a non-conforming batch of slave cylindersTransmission

Engine / equipment: Dacia models with a manual gearbox
Period mentioned: 2018–2020
Symptoms: A creak or "crack" every time the clutch pedal is pressed; the gears engage normally.
Possible cause described: A non-conforming batch of clutch slave cylinders was fitted from 1/10/2018 to 7/1/2020 (TL4, TL6, TL8 and TLX gearboxes) or up to 10/2/2020 (JH3, JR5 and JXX). The Renault and Dacia technical note reported by L'argus says to replace it with a new part number, after comparing the noise with a recording from the brand. It is not a recall.
Check for the garage: Record the noise on your phone while pressing the clutch and show it to the garage, which compares it with the brand's recording before replacing the whole clutch.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Only the 1.5 Blue dCi built from 1/1/2019 to 31/7/2021.

AdBlue pump damaged by a non-conforming module sealExhaust and emissions (AdBlue)

Engine / equipment: 1.5 Blue dCi (K9K) in the Sandero II, Logan II, Duster II, Dokker and Lodgy
Period mentioned: 2019–2021
Symptoms: Engine and/or AdBlue warning light and a "refill AdBlue, no start in X km" message that keeps appearing even after refilling.
Possible cause described: The seal of the urea (AdBlue) pump module does not conform and ends up damaging the pump. It affects cars built from 1/1/2019 to 31/7/2021. Since June 2023, Dacia has run action 0E0K, which replaces the pump and its seal free of charge on cars under 5 years and 200,000 km, but only if the customer complains.
Check for the garage: If the warning stays after refilling AdBlue, do not wait for the countdown: ask the dealer for action 0E0K (urea pump and seal) before paying for other AdBlue repairs.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Only Euro 6b 1.5 dCi (not the later Blue dCi), if the symptoms began after the 2024 update.

Judder and flat spots when accelerating on Euro 6b 1.5 dCi and 1.6 dCi engines after the 2024 emissions updateExhaust and emissions

Engine / equipment: Renault and Dacia Euro 6b 1.5 dCi (K9K) and 1.6 dCi (R9M)
Period mentioned: Cars that received the NOx-reduction update of early 2024
Symptoms: After a visit to the dealer, flat spots when accelerating and judder at steady speeds; sometimes higher diesel consumption. On the Mégane IV and Kadjar the engine may start and then stall.
Possible cause described: In early 2024 Renault and Dacia updated these engines to cut nitrogen oxides (NOx) further. According to an internal Renault technical note from June 2024, updated in February 2025 and reported by L'argus, the flat spots and judder are mainly due to the new strategy widening the periods when the NOx trap is cleaned (regenerated); to do so the engine injects more diesel, which also explains the higher consumption.
Check for the garage: Ask a Renault or Dacia dealer for the new injection ECU reprogramming for these symptoms (Dacia has offered it since May 2024 and Renault since January 2025). It is not a recall with a letter: you have to ask for it. First have them rule out other causes (particulate filter, boost pressure sensor).
Cost cited in the source: No verified estimate: the note does not say whether the reprogramming is free; ask the dealer.A rough figure from the original database, not an up-to-date quote.

Applies if: Weak points of this model from inspections, breakdown statistics and recalls; anything specific to one engine is stated in the sheet.

Three-cylinder timing chain, lights and campaigns on the Logan IIKnown weak points

Engine / equipment: Dacia Logan II and Logan MCV II (petrol, LPG and diesel)
Period mentioned: 2012–2020
Symptoms: On the three-cylinders (SCe 75, TCe 90 and 100), a chain that stretches early with a risk of serious failure and sometimes high oil consumption; failing dipped beams, tail lights and indicators, oil leaks, brake discs and suspension at the roadworthiness test; starter, ignition lock and battery.
Possible cause described: The naturally aspirated 1.2 16V is far more reliable. Many recalls (KBA): driver airbag (2012–2013 and 2018), track rod (17/9–4/12/2015), front-right caliper, steering-column mounting (23/11/2016–4/1/2018), trailer module, battery (11–14/6/2018) and bonnet latch (2/9/2020–15/1/2021).
Check for the garage: Listen to the chain when cold and measure oil consumption; check every campaign by VIN; check lights and leaks before the roadworthiness test.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Clogged particulate filter on the 1.5 dCiExhaust and emissions

Engine / equipment: 1.5 dCi (K9K) with particulate filter
Period mentioned: 2010 onwards
Symptoms: Particulate-filter or emissions warning, limp mode with loss of power and frequent regenerations.
Possible cause described: The filter clogs, especially on cars that mostly make short town trips and never complete a regeneration.
Check for the garage: Read the soot load with a diagnostic tool, run a forced regeneration at the garage and check the differential-pressure sensors and EGR. Make long road trips now and then.
Cost cited in the source: No verified estimate; from a regeneration to replacing the filter.A rough figure from the original database, not an up-to-date quote.