Vehicle:

2007 MINI Cooper, BASE 1.6

Complaint:

Loses power between 30-40 mph for a couple of seconds. Also, seems like other things “power down.” A/C blower drops down, and once the engine picks back up, the CEL flashes once.

Diagnostic Steps Performed/Parts Replaced:

Replaced alternator after it had failed a ripple test. Several codes set, and unable to find information on these codes to reset them.

Cause:

Common connections for systems covered by the codes led to discovery of corrosion in the grounds near the passenger-side fuse block and chassis grounds.

Correction:

Cleaned and treated all grounds and connections to that fuse block and cleared all codes. All symptoms disappeared.

Courtesy of Mitchell 1 SureTrack Real Fix