PSA: emissions testing fail!
Thread Starter
Racer
Joined: Oct 2015
Posts: 381
Likes: 15
From: CT
PSA: emissions testing fail!
I have a Cobb access port, and love the tune for my 991.1. In Connecticut the car needs the mission testing every two years. Essentially they plug something into the OBD 2 port and determine if all the emissions components are functional. $20 for the trouble.
I contacted COBB in advance and they advised uninstalling before testing. I did so, and drove to properly to the testing station the next day, probably 2 miles or less.
Anyway, the car failed because none of the mission controls had enough time to reset themselves after the ECU was re-flashed. The guy at the testing station asked me if I had replaced the battery. Of course!
I drove it for a few days, probably 100 miles, and had it re-tested today, and passed no problem.
Hopefully someone else can avoid this hassle in the future.
I contacted COBB in advance and they advised uninstalling before testing. I did so, and drove to properly to the testing station the next day, probably 2 miles or less.
Anyway, the car failed because none of the mission controls had enough time to reset themselves after the ECU was re-flashed. The guy at the testing station asked me if I had replaced the battery. Of course!
I drove it for a few days, probably 100 miles, and had it re-tested today, and passed no problem.
Hopefully someone else can avoid this hassle in the future.
Advanced
Joined: May 2017
Posts: 68
Likes: 9
Glad you got this solved. O2 readiness is a PITA.
To complete the PSA, O2 sensors require 30-50 miles of varied driving before they will show as "Ready". This goes for any hard reset to your ECU (i.e., reflash, battery swap, etc.).
To complete the PSA, O2 sensors require 30-50 miles of varied driving before they will show as "Ready". This goes for any hard reset to your ECU (i.e., reflash, battery swap, etc.).
Thread Starter
Racer
Joined: Oct 2015
Posts: 381
Likes: 15
From: CT
Roberttran: no there was nothing actually wrong with the car and everything was functioning normally. It's just a quirk of the electronics that it takes some driving after resetting the ECU to get everything to register properly for the emissions inspection.
Racer
Joined: Jan 2003
Posts: 340
Likes: 2
I have a Cobb access port, and love the tune for my 991.1. In Connecticut the car needs the mission testing every two years. Essentially they plug something into the OBD 2 port and determine if all the emissions components are functional. $20 for the trouble.
I contacted COBB in advance and they advised uninstalling before testing. I did so, and drove to properly to the testing station the next day, probably 2 miles or less.
Anyway, the car failed because none of the mission controls had enough time to reset themselves after the ECU was re-flashed. The guy at the testing station asked me if I had replaced the battery. Of course!
I drove it for a few days, probably 100 miles, and had it re-tested today, and passed no problem.
Hopefully someone else can avoid this hassle in the future.
I contacted COBB in advance and they advised uninstalling before testing. I did so, and drove to properly to the testing station the next day, probably 2 miles or less.
Anyway, the car failed because none of the mission controls had enough time to reset themselves after the ECU was re-flashed. The guy at the testing station asked me if I had replaced the battery. Of course!
I drove it for a few days, probably 100 miles, and had it re-tested today, and passed no problem.
Hopefully someone else can avoid this hassle in the future.
Start engine, idle cold for approx. 2 min, 10 secs.
Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
Decelerate and come to a stop. Idle in gear* for approx 5 mins.
^^^^ must be done twice
Nordschleife Master
Joined: Oct 2012
Posts: 6,535
Likes: 1,400
From: SW Colorado
A quick search will show a ton of threads about resetting the sensors. The procedure is detailed and not to exceed 3,000 RPM:
Start engine, idle cold for approx. 2 min, 10 secs.
Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
Decelerate and come to a stop. Idle in gear* for approx 5 mins.
^^^^ must be done twice
Start engine, idle cold for approx. 2 min, 10 secs.
Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
Decelerate and come to a stop. Idle in gear* for approx 5 mins.
^^^^ must be done twice
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