Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

Symptoms Indicating a Faulty Lambda Sensor

Model: (Various brands) Various
Part: Oxygen sensor

There are clear signs that indicate our lambda sensor is faulty: first of all, the engine warning light is on. The vehicle seems to operate normally, but the light indicates a problem. An increase in fuel consumption with a decrease in mileage per tank; higher fuel consumption without apparent reason; an irregular idle with the engine stuttering when stationary and unstable, fluctuating idle speeds; abnormal emissions with black smoke from the exhaust and a strong smell of unburnt petrol, and of course, a loss of performance, with slow acceleration, especially when the engine is cold. The lambda sensor measures oxygen in the exhaust gases to optimise the air/fuel mixture: if it does not function correctly, the car pollutes more, damages the catalytic converter, and reduces engine efficiency.

Posted on 9 February 2026 by ScegliAuto

Video tutorial

Related tutorials

What are the symptoms to identify faults in the ignition coil?
What are the symptoms to identify faults in the ignition coil?
(Various brands) Various In this video we show the symptoms that indicate when the ignition coils of our car are faulty. First of all, it presents ignition problems, and cons…
How to Clean the Lambda Sensor Effectively?
How to Clean the Lambda Sensor Effectively?
(Various brands) Various In this video tutorial and in the description below, you can find instructions on how to clean a lambda sensor, or an oxygen sensor. Once the sensor …
How the Lambda Sensor Works and How to Clean It
How the Lambda Sensor Works and How to Clean It
(Various brands) Various In this video tutorial, see how to clean the lambda sensor. The lambda sensor is responsible for fuel mixture, located above the catalyst. It detects…

How to Check the Oil Level on a Jeep Renegade?

To check the oil level on a Jeep Renegade, you need to open the bonnet to access the components inside the engine bay: on the lower left side of the engine block, you will find the dipstick for checking the level. This should be pulled out and thoroughly cleaned with a cloth: once cleaned, reinsert it back into its tube and pull it out immediately after. This way, you can check that the oil mark is between the minimum and maximum levels; finally, you can place the dipstick back in its tube.

Watch the video!


by ScegliAuto

More videos