Jeep Wrangler Forum

Jeep Wrangler Forum (http://www.wranglerforum.com/)
-   TJ Tech Forum (http://www.wranglerforum.com/f210/)
-   -   PO138 Code, replaced sensor, no check engine lite, still running crappy (http://www.wranglerforum.com/f210/po138-code-replaced-sensor-no-check-engine-lite-still-running-crappy-256290.html)

Under the Palms 07-16-2013 06:55 PM

PO138 Code, replaced sensor, no check engine lite, still running crappy
 
OK, I replaced my 02 sensor, bank one, sensor 2 per the PO138 code front pipe, down below the cat. I also replaced the gas cap, PO445(?). The Check engine light went out, it does seem to be running better, but still feels like running on 5.5 cylinders, definately down on power. This is a new 4.0 crate engine in a 2000 TJ. Without a CE light I'm not pulling any codes, so I'm wondering if it just needs miles to clear up, or how to find whats causing the continued problem. I'm still getting a smell under a load, only have around 350-400 miles on engine

Thanks

Under the Palms 07-18-2013 10:13 AM

Any ideas guys?

Jerry Bransford 07-18-2013 10:17 AM

A rich gasoline smell indicates a bad 02 sensor to me... indicating a false lean condition which the computer 'fixes' by making the fuel richer... too rich... to satisfy the defective 02 sensor. My guess is the Sensor 1 of Bank 1 or Bank 2 which is commonly referred to as the 'upstream' sensor. A bad 02 sensor will not necessarily generate a CEL or a code.


All times are GMT -5. The time now is 04:14 AM.