Fidget
Member
- Joined
- Mar 14, 2014
- Messages
- 23
- Reaction score
- 0
- Location
- Kent, UK
- Your Mercedes
- C180 Komp SE Classic / 2005 / 1800 (W203)
I've had the engine management light come on on my w203 C180K a couple of times and strangely topping up the fuel tank has cleared the light.
The first time was around a month ago, I was sat in traffic and the light came on. I looked it up and saw that the possible causes were either an almost empty fuel tank or a fuel system fault. The car was running fine but I had recently filled up with super unleaded as regular (which I normally run on) wasn't available. I still had 1/2 a tank of super but thought it could be the fuel, so I went to the garage, filled up on regular, turned the key and the management light immediately went out.
Around 700 miles later, I was sat in traffic tonight and the engine management light came on again. This time I had 3/4 tank of regular unleaded and the car was running fine once again. It was serviced and MOT last weekend, passed emissions test. I cannot see anything obvious wrong. Perplexed I thought I'd try refuelling again. Put £20 of unleaded in which filled to the brim. Started the car, light went out immediately!
This would ordinarily indicate to me that there might be a fault with the sender unit in the fuel tank possibly telling the ECU it's near empty, however the fuel gauge is working? The fact it happened in traffic also made me think a sensor (MAF/ Lambda?) but no issues on emissions test last week and how would refuelling clear the fault if it were a sensor? The car runs like a dream.
Having just spent £600 on suspension repairs I'm reluctant to go in for a diagnostic on the off chance. The light remains out for now, but it's bugging me.
Has anyone had similar issues? Any ideas? Grateful for any advice !
The first time was around a month ago, I was sat in traffic and the light came on. I looked it up and saw that the possible causes were either an almost empty fuel tank or a fuel system fault. The car was running fine but I had recently filled up with super unleaded as regular (which I normally run on) wasn't available. I still had 1/2 a tank of super but thought it could be the fuel, so I went to the garage, filled up on regular, turned the key and the management light immediately went out.
Around 700 miles later, I was sat in traffic tonight and the engine management light came on again. This time I had 3/4 tank of regular unleaded and the car was running fine once again. It was serviced and MOT last weekend, passed emissions test. I cannot see anything obvious wrong. Perplexed I thought I'd try refuelling again. Put £20 of unleaded in which filled to the brim. Started the car, light went out immediately!
This would ordinarily indicate to me that there might be a fault with the sender unit in the fuel tank possibly telling the ECU it's near empty, however the fuel gauge is working? The fact it happened in traffic also made me think a sensor (MAF/ Lambda?) but no issues on emissions test last week and how would refuelling clear the fault if it were a sensor? The car runs like a dream.
Having just spent £600 on suspension repairs I'm reluctant to go in for a diagnostic on the off chance. The light remains out for now, but it's bugging me.
Has anyone had similar issues? Any ideas? Grateful for any advice !