Warning light after failed emission test - should I worry?

My 3 Series had its MOT today and showed a problem with the emissions test. 1st fast idle test it failed with twice the limit. The car display showed engine managment system in "limp home" mode. So they did an immediate 2nd fast idle test and it came in with less than the limit and it passed.

They told me this error message would remain on the computer in the car and would be seen and checked at the next service. I had had a full service last week. So I went to the dealer. The receptionist was no help and booked it in or a diagnostic check for a week's time.

Do I need to have this check, or can I ignore it? No problems are showing on the panel.

Asked on 26 September 2012 by E Rich

Answered by Alan Ross
You don't need a diagnostic, just get them to reset the ECU, should take 10 mins. On just wait until the next service.
Similar questions
I have a three-year-old BMW 320D with automatic transmission. Recently I have noted that occasionally the car rocks from side to side, as if being subjected to a strong side wind, when being held stationary...
My Ford Focus 1.6 has done 88,000 miles. It kept showing an intermittent display fault with the odometer, speedometer, fuel gauge and temperature gauge all not working. Now none of these have worked at...
I'm thinking of buying a used Audi A5; however, DVLA records show that the car failed a recent MoT due to: -Nearside front Front suspension has excessive play in a lower suspension ball joint front joint...
Related models
Superb to drive. Great handling and steering. Upmarket image. Economical diesel engines culminating in amazingly efficient 320d Efficient Dynamics at 109g/km of CO2.
 

Ask Honest John

Value my car

Save £75 on Warranty using code HJ75

with MotorEasy

Get a warranty quote

Save 10% on GAP Insurance

Use HJ10 to save on an ALA policy

See offer