Renault K4J / K4M 1.4 and 1.6 16vLambda sensor
Faulty lambda sensors on the 1.6 16V (K4M) on the 1.4 and 1.6 16v
Why this rating?
Low severity: A nuisance or wear. It does not immobilise the car or damage other parts.
Frequency occasional: Gebrauchtwagenberater.de mentions faulty sensors 'from time to time' on the Duster 1.6, and Fiches-auto.fr cites the sensor among the usual parts of the 1.6 16v 110 PS in the Mégane I and Scénic I. Two independent publications, no figures: occasional.[1][2][3]
Symptoms
- Engine warning light on and misfires when the sensor fails, according to Fiches-auto.fr.[2][3]Engine warning light: other faults that cause it · Garage soon
Why it happens
Fiches-auto.fr includes the lambda sensor among the parts that characterise the 1.6 16v in the Mégane I and Scénic I, and links it to misfires and the engine warning light.[2][3]
On the Duster, Gebrauchtwagenberater.de adds that in a few cases the catalytic converter was also damaged, without specifying the connection.[1]
If it is not repaired: According to Fiches-auto.fr, a faulty sensor causes misfires and the engine warning light; Gebrauchtwagenberater.de adds that in a few cases the Duster's catalytic converter was also damaged.[1][3]
Affected cars and years
Mégane I and Scénic I (1.6 16v 110 PS, according to Fiches-auto.fr) and Dacia Duster I (1.6 105 PS, according to Gebrauchtwagenberater.de).[1][2][3]
| Version | Years | Codes |
|---|---|---|
| 1.6 16V 110-135 hp with variable valve timing unit (K4M, 1998-2020) | since 1998 | K4M |
| 1.6 16V 105-110 hp Dacia, without variable valve timing unit (K4M, 2004-2020) | since 2004 | K4M |
Models fitted with the affected versions
Dacia
- Dacia Logan I2004–2012
- Dacia Duster I2010–2017
Renault
- Renault Clio II1998–2012
- Renault Clio III2005–2012
- Renault Mégane I1995–2002
- Renault Mégane II2002–2009
- Renault Mégane III2008–2016
- Renault Scénic I1996–2003
- Renault Scénic II2003–2009
- Renault Kangoo I1997–2007
- Renault Laguna II2001–2007
- Renault Fluence2010–2016
- Renault Scénic III2009–2015
How much it costs to repair
Includes: Lambda sensor (oxygen sensor) and replacement labour.[1]
No prices are published in the sources consulted.
Prices in Spain, including VAT. A workshop hour costs on average €38–66 at independent garages and €77–134 at dealerships in Spain, depending on the region and the brand. How we calculate costs
How to check for it before buying a used car
- Check the fault memory and ask whether the sensors have already been replaced, especially on high-mileage cars.
Parts needed
The part or kit that fixes this fault, according to the sources.
1.6 16V K4M lambda sensor
Measures the oxygen in the exhaust to regulate the mixture.
Affiliate links: if you buy from these shops, MotorFiable may receive a commission at no cost to you. Check compatibility against the registration plate or VIN before ordering. More information
How to prevent it
- Have the engine warning light diagnosed as soon as it appears, to tell the sensor, coils and other sensors apart.[3]
Recalls, campaigns and claims
As of 30 October 2026, we have no record of recalls, campaigns or extended manufacturer warranties for this fault. Check with an official dealer using the chassis (VIN) number: they will tell you whether the car has any outstanding campaign.
What owners say
Frequently asked questions
What can you do now?
We will put you in touch with a partner only if you authorise it in the form.
Other 1.4 and 1.6 16v faults
- Medium severityFrequency: Very frequentIgnitionIgnition coil failureThe individual ignition coils are the most-cited fault of the K4J/K4M in the European Renault versions: they fail frequently and cause jerking, loss of power and the engine warning light coming on. It is a cheap electrical part to replace, not internal engine damage.Appears at around 30,000 km
- High severityFrequency: OccasionalTimingTiming belt breakage or premature failureThe K4J/K4M's timing belt is a dry type (not running in oil), but several sources document breakages before high mileage is reached, including one case in the Renault Laguna II with valve-to-piston contact. Sticking to the replacement interval is the best prevention.Appears at around 89,000 km
- Medium severityFrequency: CommonElectronicsCrankshaft position sensor failureThe crankshaft position sensor (capteur PMH) appears repeatedly in the reliability sources for almost every generation with this engine, with hard cold starting, stalling or the car cutting out unexpectedly. It is a cheap part, but the failure can leave you stranded.
- Medium severityFrequency: OccasionalTimingVariable valve timing unit failure (dephaser pulley)K4M versions with a variable valve timing unit can suffer a failure of the unit's pulley (déphaseur): unstable idle, hard cold starting and a metallic knock on start-up. It is a minority of the documented cases, but it recurs across several different generations.
- Low severityFrequency: RareLubricationOil consumption (no documented pattern on this engine)Unlike many modern turbo engines, the sources consulted for the K4J/K4M do not describe a pattern of excessive oil consumption in any of the cars or versions covered by this page.
More faults of the lambda sensor on other engines and cars
- Medium severityFrequency: Common1.3, 1.5 and 1.6 gasolina (serie M)Faulty catalytic converter and lambda sensors on the 2005-2010 Swift (engine warning light)On the 2005-2010 Swift the catalytic converter often fails at around 50,000 km according to gebrauchtwagenberater.de, and several 1.6 owners cite the lambda sensor. The warning is the engine light; on the Sport the catalytic converter is integrated with the manifold.
- Medium severityFrequency: Occasional1.2 8v FireSensor failures: lambda sensor and crankshaft position sensor (TDC)The 1.2 8v Fire can suffer sensor faults: the lambda sensor (warning light, rough running) and, in the Fiat Punto, the crankshaft position sensor (TDC sensor), linked to misfires. These are minority issues, but they recur across several models with this engine.
- Low severityFrequency: Common1.4 and 1.6 TU3/TU5Sensors that fail: lambda sensor and temperature sensorThe lambda sensor and the coolant temperature sensor are, along with the coils, the components most cited as faulty: they cause an unstable idle, the engine warning light coming on or a cooling fan that does not behave normally.Appears at around 25,000 km
- Low severityFrequency: Common2.0 and 2.4 VVT-iLambda sensor failure on the 1AZ-FE (RAV4 and Avensis 2.0 VVT-i)Lambda sensors are the part that fails most in the RAV4 2.0 VVTi testimonials (about 20 cases among 75 testimonials) and also appear in those for the Avensis 2.0 VVTi; it is a limited-cost fault, not an engine one.Appears at around 150,000 km
- Low severityFrequency: Occasional1.6 DIG-TLambda sensor and other engine sensor failuresAn engine warning light caused by a lambda sensor or other sensor failure is one of the most repeated issues in the owner reviews consulted for this engine, although it is almost always fixed by replacing the sensor, with no damage to the engine.
- Low severityFrequency: Occasional1.0/1.2/1.4 EcotecFaulty lambda sensors on the 1.2 and 1.4 petrolOpel's 1.2 and 1.4 petrol engines (Twinport and A series) show faulty lambda sensors on the Corsa C, Corsa D and Astra J. The usual consequence is the engine warning light and a poorer-regulated mixture; it does not affect the mechanics.
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Sources
Every fact on this page links to its source. If you find an error, let us know.
- Dacia Duster I: typische Probleme & MängelGebrauchtwagenberater.de · Motoring press · consulted 30 October 2026 · in German
- Fiabilité et pannes de la Renault Mégane 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
- Fiabilité et pannes du Renault Scénic 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French