So driving to work this morning and the engine management light appeared, the car was in Sport Mode at the time, I switched to different modes to see if it went off but it stayed on.
The onboard diagnostic tool says no faults found.
The car is due for a service in 6 weeks, so I was wondering if that’s why it has come on, but I would of expected to see a spanner icon not the engine management icon ?
6 weeks though seems a bit too soon ?
Any thoughts.
Update.
The light has gone off by itself ??
Excellent - a self-fixing car.
Could be a sensor that degraded temporarily, or something to do with emissions control going out of spec but restoring or only under some conditions (EGR may only operate intermittently). I don’t know if the error codes of faults that have cleared are retained, but I guess they might be.
Dealership want £150 to check for any codes .
Someone here in work has a code reader so I might ask him to take a look without resetting anything.
Do you know where the OBD is on the DS4 E Tense.
I did Google this but the info I found gives the incorrect location .
Apparently its drivers side under the the dash to the right hand side , but when we pulled the cover off its not there ?
Maybe in the UK version it’s on the passenger side? And where is the OBD port located in your son’s Astra?
Just used a code reading to see if the car has logged the error and it found P2271 which I believe is something to do with the oxygen sensor ?
the light has gone off now but I’ll still mention it when the car goes in for its service.
Yeah, I have the exact same error as we speak. I also had it in december last time but it disappeared by itself 2-3 weeks later. I’m expecting it to do that again soon.
Heated oxygen sensor (HO2S) 2
bank 1 - signal stuck rich
Yeah Jay thats it.
Also known as a Lambda sensor.
Apparently known to fail on older Vauxhalls.
I was wondering if it’s down to low mileage ?
I think its the sensor that screws into the exhaust, and measures the Oxygen Fuel mix in the exhaust fumes ?
The engine management light came on in my car when I switched to Sport mode and the ICE kicked in.
It stayed on for 2 or 3 days but then went by itself, I did though drive the car more in Sport mode over those 2 or 3 days to see if it might of burnt off any crud on the sensor, and it seemed to work .
My theory is the sensor isnt reaching max temp on my short journeys causing a build up of crude.
Or am I thinking something totally wrong ?
Found this on Google:
The DS4 Heated Oxygen Sensor (HO2S), also known as the lambda sensor, monitors unburnt oxygen in the exhaust gases. It helps the engine control unit (ECU) adjust the air-fuel ratio for optimal fuel efficiency and lower emissions. The integrated heating element allows the sensor to reach operating temperature faster. [1, 2, 3, 4, 5]
Common Symptoms of a Faulty DS4 HO2S
Check engine light on the dashboard.
Increased fuel consumption and poor fuel economy.
Rough idling or engine stalling.
Engine hesitation or lack of power during acceleration.
Diagnosis and Testing
Scan for diagnostic trouble codes (DTCs) using an OBD2 scanner to isolate upstream (pre-cat) or downstream (post-cat) sensor errors.
Check heater resistance with a multimeter set to ohms across the heater pins; typical specifications range between 2 to 30 ohms depending on the exact engine variant. An open circuit (infinite resistance or ‘OL’) means the internal heater has failed.
Inspect wiring harnesses and connector pins for loose contacts, corrosion, or melted insulation. [1, 2, 3, 4, 5]
Don’t look to Google or AI for the answer, because a lambda sensor failure is unlikely in a low-mileage car. Problems with these sensors typically start after 60,000 miles.
So what is likely in a low-mileage car?
Bad petrol?
I’m currently at 45,000 km—so just under 30,000 miles. To me, that’s low mileage. And considering that I cover most of that distance in Electric mode, the mileage on the ICE is actually very low.
I’m at 64.000 km, but I think I wasn’t clear enough in my question.
You said a lambda sensor failure is unlikely in a low mileage car, and my question was if a lambda sensor failure is unlikely, what is then more likely to be the issue?
I don’t know. You need to read all the error codes. It’s too complicated to simply give an answer here.
That was the only code showing.
It came on when I switched from comfort mode to sport mode during driving, it then stayed on for 2 or 3 days no matter what mode the car was in .
I then put the car in sport mode and drove harder than I normally would for a day or two, the light then went off and has stayed off.
I’m thinking the sensor might of pick up a bit a crude initially and and perhaps burnt off when I drove the car in sport mode for a few days ?
Either way, thats the only code showing .
I’ve left it on there so the dealer can see it when it goes in for its service.
There is likely too much air in the fuel mixture. The first step is to check the air intake for leaks.
You could also check the lambda sensor wiring, as a rodent might have been in that area.
I’ve emailed my dealership with the code, they’ll check it out when the car has its service in a few weeks.
Obviously if it comes back on or I notice issues with the car it will go straight in.
NEW battery done the trick mate… thank you
The lamp is gone today.
I just love technology.
