1993 190E 2.6.

Coming home this afternoon my CEL came on. I checked the codes on the DM by the battery and got an 8, and an 11.

Can anyone advise me on what these mean and suggest methods of trouble shooting?

The car seems to be running just fine, and the fuel consumption seems normal.

Thank you in advance,
David

PS. After a bit of searching I have discovered that a code 8, refers to "Altitude Pressure Signal from the EZL Ignition Control Unit", and a code 11 points to "Air Injection System" ?!?

Are these two systems inter related some how? I had just checked the codes two weeks ago and all was clear. Should I just clear them and see if they come back ?

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1993 190E 2.6 135k
1989 Ford Thunderbird SC 5 Spd 79K