emissions

Just bought a 2001 TJ 4 cylinder. I don’t have much experience with cars but have wanted to get handier, was going to use it as an occasional driver and learn how to fix things up along the way. I took it for a pre-purchase inspection but the mechanic and I both missed that the entire emissions...

I am apparently missing the vapor hose that goes from the charcoal canister to the fuel tank with the "T" connection on it. Anyone know if there is anything special about that hose as far as a specific type of connection or is there an inline valve of any sort or can I just make one up using...

I am troubleshooting a p0431 code on my 05 Sport, "warm-up catalyst efficiency below threshold, bank 2". I have ordered both NTK o2 upstream sensors which may correct the problem. However I plan to also replace the Pre cats as PM cuz it has 101k. I plan to unbolt the 2 pipes connected to the...

On day 3 of my new to me 05 Sport with 101k I'm in rush hour traffic, the tj bucks 1x and the CEL comes on. AZ reads the CEL and it shows a P-0431 code which says... "Warm Up Catalyst Efficiency Below Threshold (Bank 2)" There are two catalytic converters coming off the exhaust manifold. My...

Hey all, So my '01 TJ is throwing a P0432 code. Upon easy research, it's that the "main catalyst efficiency below threshold." I haven't noticed any drop in performance and the vehicle is pretty new to me so I don't know if it's affecting the mileage. I've gotten a quote for around 1,000$ for...

Hello all, I have a 2004 wrangler. My Anti drain back valve on my fuel pump went bad so I am replacing my fuel pump with a Bosch one as per many recommendations on this and other Jeep forums. When I was dropping the gas tank I stupidly didn't notice one line connected to a small white valve in...

Hi all, I've been forced to get my catalytic converter fixed because I'm moving to a state with emissions testing. I've had the P0420 code for over 5 years now. Recently, I had a dealer install a new converter, but the code is still present. I think this is because the converter the dealer put...

What's the difference between a CARB vs. NON CARB compliant catalytic converter system? I have an 06 X with 4.0. I'm considering replacing my cat system with Magaflow system. There are two offerings, part number 93649(non-carb compliant) and 458027 (carb compliant). Does the jeep ECM know if...

What are Bank 1, Bank 2, etc.? Since this question pops up from time-to-time, here's an easy to follow diagram that illustrates what they mean when your OBDII code scanner (or manual) tells you something like "O2 sensor, Bank 1, Sensor 2": What does upstream and downstream mean? Simple...

alright gents, so I'm thinking its time to change out the O2 sensors on my 2006 TJ Unlimited Rubicon. I'm attaching two pictures... one of the pictures is a diagram with the engine and where the O2 sensors go. The second picture is the O2 sensors. Will someone please tell me what location...

hope someone can help us out. Unable to pass smog, says Cat Coverter is not ready. We've performed the drive cycle numerous times and is a daily driver too. It's been tuned up and looked over by our mechanic too. Everything is in good shape. 02 TJ Wrangler, 78k miles. Replaced: oxygen sensors...

One more reason I hate the current governments overreach. Always trying to govern everything! http://www.bikebandit.com/blog/post/the-epa-wants-to-make-it-illegal-to-modify-your-bike-for-racing