I have a 2014 Roomster DSG with the CBZB engine. When driving back from the dealers following a service my EPC light came on as I approached home . I switched off and restarted and it went away. However, since then (3 weeks)  I have observed increased fuel consumption and what may be a misfire. The misfire manifests as a slightly uneven tickover and some but sporadic hesistation when accelerating. The car has done 121,000 miles so not in the first  flush of life. 

 

I would talk to the dealer but they are always just full of ..it and, of course, never wrong. 

 

Before I start randomly replacing the usual suspects under the bonnet I was thinking an ODB reader may help. Can any member suggest an inexpensive reader or reader type I could buy that would be compatible with a Roomster?

 

 

Not the answer to the question, but.

 

If you think you can replace stuff have you checked stuff, like the spark plugs?

Have you looked at the air filter, is it there and clean?

 

???

What was being done at the Service?, 

Were the spark plugs replaced, was the air filter replaced.  First thoughts for me were the done correctly and leads / coils connected securely and no breather pipes left off or punctured. 

Correct plugs and gapped, yes they come pre gapped, but they can get knocked. 

 

You do need to see if misfires are logged and which cylinder.  

 

??

Out of interest how were they as far as doing the oil change, was the Oil level correct when you got it back, checked when hot? 

Edited 23 December, 20241 yr by Ootohere

6 minutes ago, Ootohere said:

Not the answer to the question, but.

 

If you think you can replace stuff have you checked stuff, like the spark plugs?

Have you looked at the air filter, is it there and clean?

 

???

What was being done at the Service?, 

Were the spark plugs replaced, was the air filter replaced.  First thoughts for me were the done correctly and leads / coils connected securely and no breather pipes left off or punctured. 

Correct plugs and gapped, yes they come pre gapped, but they can get knocked. 

 

You do need to see if misfires are logged and which cylinder.  

The lastest service this month was the simple oil change service (I had taken a service plan). Therefore oil and filter. The Nov 2023 service was a major service with the plugs changed, air filter, cabin filter, oil filter and oil. They listed the plugs as changed but the dealer is a bent as the come and may not have done. 

 

I have looked and cannot see any obvious defects. Air filter is clean, really clean, almost uncanny. Oddly the cabin filter was jammed up with debris. That has nothing to do with the engine but I suspect the dealer on the 2023 service did not replace the cabin filter despite the invoice saying it did. I have not looked at the plugs yet as I do not have the necessary tool to remove the plag caps. I am planning to buy one, the bodgy way with the cable tie looks sure to end in a snapped lead. I would like to know what the diagnostics say but don't have a reader. I could ask the dealer but I just know they won't have done it. The service plan says they will do one but I doubt it happened. I also know they charge £120 to do one. Or at least they wanted to in 2023.

 

I am relatively competent but probably not a competent or experienced as many contributoers to this forum. I have had this car since 2016 and have not had to do much if anything to the engine. The brakes and dodgy wiring issues, yes. With the exception of the COVID period, it was main dealer serviced throughout. I changed the oil and filters twice over the COVID period. 

 

The last time I was trying to fix a random misfire was years back on a Hyundai which the dealers said was perfectly OK but it wasn't. I started swapping out bits. Turned out to be a faulty cam position sensor. Fuel consumption improved from 35mpg to 45mpg and peformance was transformed. I have just said on another thread that Hyundai's warranty is fictional. "Can't fault it sir!"

Sorry, should have said. The oil used should be the right stuff when the dealer does it but I can’t see what they do in the workshop. When I changed the oil in the lockdown and when I top-up, I always use the Castrol Edge 5-30. I confess, I trust the dealer to out in the right amount, and have not checked it. The engine uses a little oil between services but not much, well les that one litre.

 

Coincidently I was going to ask the same so if anyone has an OBD reader please offer recommendations.

I got a carista last yr and its very good for clearing codes and doing extra settings and stuff. 

i also have a elm 327 and torque pro. the dongle seemed to have died thus getting the carista. Torque is much better for live logging data as carista only seems to do snap shots, where the torque pro app will log continuously for what ever parameter you choose and can be saved as a text file iirc. much better for diagosing a problem and isolating when something is happening.

On 29/12/2024 at 14:27, edbostan said:

Coincidently I was going to ask the same so if anyone has an OBD reader please offer recommendations.

 

I have a genuine Carista with the paid for app. So far it's done what it's supposed to but I think the subscription price is a lot high.