|
A vacuum leak will cause problems no doubt and if you over oiled the K&N that could cause buildup and throw off the MAF so that's why the dealer doing the work mentioned the stock filter. Maybe some of your codes were old ones that never got erased, but I don't see where a vacuum leak or the air filter would cause the low O2 voltage codes. Hopefully they're old codes.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
|