One problem related to gas recirculation valve (egr valve) has been reported for the 2005 Toyota Tacoma. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Tacoma based on all problems reported for the 2005 Tacoma.
I was driving on the highway and the check engine light came on. I immediately took it to the Toyota dealer as I was right up the street from them. They scanned for the service code and it told them there was a mis-fire in the #6 cylinder. They checked the spark plug coil and said it was faulty and replaced it. When I picked up the truck from the dealer the check engine was still on. They took it back into the service bay and after 20 minutes called me over to tell me there was coolant leaking into the #6 cylinder and was determined that the engine block was cracked. This truck has never over-heated and they could not explain it. After checking the internet for others with the same problem, I found there were a few others and the mechanic told me that he has seen it before in this engine block. I can't afford a new truck, so I am stuck with paying for not only the coil replacement but also the new or refurbished engine block ($5,000+). It would be great if the NHTSA could look into the integrity and engineering of the engine block in the 2005 4. 0l v6 engine in the Toyota Tacoma.