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Not sure how it works elsewhere but here in Washington if you take a vehicle with an OBD II interface to the emission station they just plug in and run an emission diagnostic report. I think just about anything starting with a P will cause a failure. I replaced the hose this weekend (final cost...

Might be. Here in Washington if you spend $150 or more at an "Authorized Emission Specialist" attempting to address the emission failure you can get a waiver on the inspection if you fail the test for the second time (Washington Vehicle Emission Check Program - FAQ see "Who can repair my vehicle...

It is my internet-karma duty to +1 this post. :) I have an '02 TJ that failed smog check with the exact same code: P0455 (gross leak). Took it to the shop because I didn't have time to debug myself (in hindsight, this was a mistake) and after spending SEVERAL HOURS with the vehicle and replacing...