# 2013 Mustang GT O2 sensor question **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mustang, ford\ **Created:** [August 9, 2024, 4:54pm UTC](https://community.cartalk.com/t/2013-mustang-gt-o2-sensor-question/195654 "2024-08-09T16:54:18Z")\ **Posts on this page:** 1\ **Showing post:** 33
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [August 12, 2024, 9:23pm UTC](https://community.cartalk.com/t/2013-mustang-gt-o2-sensor-question/195654/33 "2024-08-12T21:23:32Z")
It sound like you are on the right track, but the problem-causer is hiding. Be sure to check the PCV system and that the brake booster holds vacuum. fyi, a similarly hard to resolve O2 sensor problem was discussed here a few months ago: > [@Water-cooled VW Beetle perplexing problem](https://community.cartalk.com/t/water-cooled-vw-beetle-perplexing-problem/194866): > > I found this perplexing problem described in a classic-car magazine (Classics World, May, 2024). VW Beetle (new type , water-cooled), don’t know model year, but OBD II era . OBD II codes say “too lean”. But no other obvious symptoms. Starts and runs well. Owner thinks there may be a vacuum leak in the valve cover area , so replaces the oil filler cap, thinking the cap’s seal may be leaking, allowing air into the engine. After replacing the cap, the engine won’t run. I can’… --- _[View the full topic](https://community.cartalk.com/t/2013-mustang-gt-o2-sensor-question/195654)._