When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
Sometime resolving a sensor issue will fix other codes that come up. Thats why I would go with the sensor first, once fixed clean the codes and see if the 4th gear one comes back.