I'm getting a P0401 Insufficient EGR flow DTC and I plan to unbolt the intake manifold according to TSB 99-085.

Question:

What size bolts attach the intake manifold to the engine block? (10mm, 12mm, 14mm)? Will i need a breaker bar or extensions?

I don't have any metric tools and will need to buy some just for this job. Ideally, I can buy the just ones I need and will have them on hand so I don't get stranded half-way into the job by missing a key tool.

Thanks for any suggestions.

 

if its anything like a 5th gen a 10mm will take half the car apart but i would just buy a full set of metric sockets so that you have them around if you should ever need them

 

thanks for the info on 10 mm being a popular size on a typical honda... turns out a friend has a complete set of tools he's willing to lend, so i got that covered phew!