Won't pass inspection...
Thread Starter
Junior Member
Joined: May 2015
Posts: 55
Likes: 3
'96 SL500 Sport
Won't pass inspection...
I'm about to take possession of a 2001 ML55. I bought it from my indie mechanic and it's ready to go, except he's having trouble getting it to pass inspection.
It won't get past these two monitors- secondary air pump and the evap system.
He's been working on German cars for over 30 years, so he knows what he's doing and this has him stumped.
He's tried every trick in the book and still no go. It only has to pass one more for him to put an inspection sticker on it.
I thought one of you might have had the same issue.
Thanks for any suggestions you might have.
It won't get past these two monitors- secondary air pump and the evap system.
He's been working on German cars for over 30 years, so he knows what he's doing and this has him stumped.
He's tried every trick in the book and still no go. It only has to pass one more for him to put an inspection sticker on it.
I thought one of you might have had the same issue.
Thanks for any suggestions you might have.
Senior Member
Joined: Oct 2023
Posts: 472
Likes: 239
From: New Hampshire
ML 63 AMG
I'm about to take possession of a 2001 ML55. I bought it from my indie mechanic and it's ready to go, except he's having trouble getting it to pass inspection.
It won't get past these two monitors- secondary air pump and the evap system.
He's been working on German cars for over 30 years, so he knows what he's doing and this has him stumped.
He's tried every trick in the book and still no go. It only has to pass one more for him to put an inspection sticker on it.
I thought one of you might have had the same issue.
Thanks for any suggestions you might have.
It won't get past these two monitors- secondary air pump and the evap system.
He's been working on German cars for over 30 years, so he knows what he's doing and this has him stumped.
He's tried every trick in the book and still no go. It only has to pass one more for him to put an inspection sticker on it.
I thought one of you might have had the same issue.
Thanks for any suggestions you might have.
EVAP system will probably need a smoke machine to check for leaks. On a 20+ year old truck I’m sure there’s a crack in a hose or some other air leak holding you up.
Good luck! 👍
Thread Starter
Junior Member
Joined: May 2015
Posts: 55
Likes: 3
'96 SL500 Sport
Thanks. I sent your idea on checking the evap for leaks to my mechanic.
He replied that there are no faults for anything. He also said "The problem is that the monitors won't set for the evap and secondary air".
He replied that there are no faults for anything. He also said "The problem is that the monitors won't set for the evap and secondary air".
Senior Member
Joined: Oct 2023
Posts: 472
Likes: 239
From: New Hampshire
ML 63 AMG
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Thread Starter
Junior Member
Joined: May 2015
Posts: 55
Likes: 3
'96 SL500 Sport
He reran the test first thing in the morning after a cold night and the monitors reset.
Good thing too. He left for vacation after work yesterday. If it didn't pass, I would have to have waited at least another week.
Good thing too. He left for vacation after work yesterday. If it didn't pass, I would have to have waited at least another week.
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Senior Member
Joined: Oct 2023
Posts: 472
Likes: 239
From: New Hampshire
ML 63 AMG
Ah, makes sense. I know at least the evap system test needs to happen on a cold start so that makes sense. Great news! 👍
