KNOWN FAULTS · Renault
Renault Scénic (IV) / Grand Scénic (IV) 1.5 dCi / Blue dCi (K9K) common problems.
2016–2022 · Diesel
Sources are not verified in real time and no entry confirms that your car is affected.
4 known faults with sources
Applies if: Weak points of this model from inspections, breakdown statistics and recalls; anything specific to one engine is stated in the sheet.
Suspension, oil leaks and campaigns on the Scénic IVKnown weak points
- Engine / equipment
- Renault Scénic IV and Grand Scénic IV (petrol and diesel)
- Period mentioned
- 2016–2022
- Symptoms
- Suspension defects well above average at the first roadworthiness test, lights, misaligned doors and interior rattles, engine and gearbox oil leaks after a few years and timing chains that may need replacing before 100,000 km.
- Possible cause described
- Recalls: automatic-gearbox console insulation (DW5/DW6) that could release P, curtain airbags, cooling-fan capacitors on manual 1.5 dCi (K9K) and 1.7 (R9N), and an R9N fuel line that could leak.
- Check for the garage
- Check every campaign by VIN; check the suspension, oil leaks and chain noise when cold.
- 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.
Sources from the original database
View full entryClogged 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.
Sources from the original database
View full entryApplies if: The Blue dCi has another EGR system: the sheet is for the 1.5 dCi with an electric EGR valve.
EGR valve sticking with deposits on the 1.5 dCiExhaust and emissions
- Engine / equipment
- 1.5 dCi (K9K) with an electric EGR valve
- Period mentioned
- No specific period published
- Symptoms
- Uneven idle, jerks when accelerating, lack of power or the engine going into limp mode, sometimes with the engine warning light on.
- Possible cause described
- Soot and oil deposits leave the EGR valve stiff, stuck closed or not closing fully. According to Pierburg it is rarely a fault of the valve itself: the oil comes through the crankcase breather, a turbo with worn bearings or a blocked oil return, late oil changes or too high a level, and many short trips, above all in winter.
- Check for the garage
- At the workshop: read the codes with diagnostic equipment (EOBD P0400 to P0404 or P0172; Renault DF077, DF084 or DF241), test the valve electrically and its opening with the engine warm, and find where the oil comes from (breather, turbo, level). Pierburg advises against cleaning it, as it can be damaged: it is replaced if faulty, and an engine ECU update sometimes solves it.
- Cost cited in the source
- No verified estimate; ask the workshop for a quote for the EGR valve.A rough figure from the original database, not an up-to-date quote.
Sources from the original database
View full entryApplies if: Only if the injection pump is a Delphi (it says so on the pump): depending on the version, the 1.5 dCi has Delphi or Siemens/Continental.
Delphi injection on the 1.5 dCi: air in the fuel, metal swarf, regulator or injectorsInyección
- Engine / equipment
- 1.5 dCi (K9K) with Delphi common-rail injection
- Period mentioned
- No specific period published
- Symptoms
- Hard to start or will not start, stalls, loses power or jerks; sometimes air bubbles show in the clear fuel pipe.
- Possible cause described
- The usual faults of the K9K's Delphi system are air getting into the low-pressure circuit, metal swarf from the pump contaminating the whole system, the pump's inlet metering valve (IMV), injectors with too much return flow and the rail pressure sensor.
- Check for the garage
- At the workshop, in this order: look for air and leaks in the low-pressure circuit and prime it; check the fuel filter bowl for metal swarf (if there is any, the whole injection system is replaced); measure the rail pressure, the IMV regulator's resistance (4.8–5.8 Ω) and each injector's return flow (25 ml at most in the test). A new injector's code must be written into the ECU.
- Cost cited in the source
- No verified estimate; it varies widely, from a filter or the regulator to the whole injection system.A rough figure from the original database, not an up-to-date quote.