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.
Not sure about 4th-gen, but in my 2000 ES300 I was able to use a deep socket with a very long extension and u-joint to unscrew it from the top of the engine. You might as well try it, if that won't help, you will likely have to get at it with a stubby wrench or something similar.