92 240 Check Engine Light/New Down Pipe

[jeffmaciejewski]

Hi all--

I just installed a new down pipe and am now getting a check engine light. I retrieved the codes and they're 1-1-3 (fuel injectors) and 2-3-2 (Lambda adjustment). I have noticed the engine to be running a little rough idle. I had no engine light before replacing the down pipe.

During the installation of the down pipe, I tried to be careful and not interfere with the O2 sensor (on mine it is installed directly into the catalytic converter--I have an aftermarket IPD cat). But I'm thinking that some debris might have fouled the sensor and is causing the rough idle and is causing the check engine light.

Problem is, new O2 sensors ain't cheap--so I want to be reasonably sure about the diagnosis before I make the plunge and buy a new O2 sensor in an effort to correct the system.

Any thoughts about this diagnosis of the check engine light?