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1991 Trouble Codes

Tommy4949

NAXJA Forum User
I have trouble codes coming up in my Heep...

13 - Fault in the map sensor pneumatic circuit.
51 - Lean condition is indicated.
35 - Fault in fan relay circuit.

I got all these codes together. I then unplugged the battery to rest them after I cleaned out the map sensor vacuum line and port on the intake. A few days later, the map sensor code came back. The next time I drove it, the rest of the codes came back. Any idea what is going on? TIA

Edit: The electric fan is still working.
 
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