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Volvo
S70
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Check Engine Light Due to Failed Secondary Air Pump on Volvo S70

Problem Description and Possible Solution

The secondary air pump may fail causing the check engine light to illuminate. The cause is often a failure of the air pump check valve that contaminates the air pump with exhaust gas/moisture.

Problem Data
RepairPal Verified
Average mileage: 134,040 (18,500–223,000)
3 model years affected: 1998, 1999, 2000
18 people reported this problem
Comments
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This is an easy fix. Check valve fails, condesation enters pump, bearings freeze, shazam CEL light is on. Air pump is under battery tray. Buy a rebuilt pump with warrenty on ebay ~$150. Buy a new check valve ~$50. Buy a new relay (#2 in main fuse box) ~$20. Replace parts. Done.
I recently bought my 98 volvo s70 from a guy that had pulled out the check engine light. Well comes to find out that i am throwing 10 codes and had to do with the smog pump/air pump