Took my 1997 civic ex (150,xxx miles) AT, today to get smogged and it failed, Gross polluter, spoke to the guy testing it and he said I had the wrong air filter??? Also said (vacuum lines to sensor disconnected) I didn't see anything disconnected. Any help would be great guys thanks.

 

Swapped engine and ECU?

CEL codes?

 

D16y8 motor. Everything else is stock other then a magnaflow exhaust, still have the cat

 

Also it's not throwing any codes

 

You have a two-stage VTEC head, that is not stock. Note the non-stock wires running from the VTEC solenoid to somewhere under the battery.

The NO is the only one at GP level but HC and CO are also well over the max. Failing all 3 pollutants at the same time but running OK usually means the cat is dead.

 

Post the head, block, and ECU codes.
https://honda-tech.com/forums/honda-.../#post48684945

Does the CEL work?
https://honda-tech.com/forums/honda-...lists-1901557/

High O2 levels also suggest an exhaust leak that is contributing to the high HC levels.

 

So from the looks of it, I have an exhaust leak and need a new cat? What would be the disconnected sensor stated on the list? Also thanks for your guys advice

 

 

That is not the stock block either. Has this car ever passed CA smog check in its present configuration?

 

I just bought the car, from someone, it was no op, obviously I know why now, but it was last registered 2014 so I'm assuming it did.

 

Unwise purchase.

What ECU is running the engine?

 

Thats not a d16y8, not sure how you got that..

I see the previous owner ran a wire to engage the 16 valve so that shouldn't be a problem. Did you ask the guy what vacuum lines he was referring to?

 

The smog guys response was "see your mechanic". I figured it was smithing I could find after he was no help, I'm taking it to a mechanic today to check it out

 

Is your idle high? The dumbass didn't even specify what air intake was wrong. Was he talking about the intake manifold or the intake air filter box.

 

Is your car an HX or an EX? I'm trying to wrap my head around why he would say your EGR was DISCONNECTED.

 

In CA the seller has the legal obligation to provide a valid smog test at the time of purchase.

Take that for what you will.

 

Lift this cover up and take a picture.

 

@tony it's a ex model, and I believe the "disconnected" is referring to the vacuum line. Also the car is now at my mechanic so I cannot post pictures of it till I get it back

 

UPDATE**** so I took it to my mechanic and and his diagnostic was that the cat was the original one so he had a muffler shop install a new one, he also tucked those loose wires away. Smogged it again and passed with flying colors. Thanks for everyone's input and opinions.