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Message: <blockquote data-quote="TX_Snake" data-source="post: 1401267" data-attributes="member: 20296">My car is having trouble passing emissions in TX. I could use some guidance from the collective wisdom here....Most recent inspecting report from this past week indicates a well running car minus a failure at high speed test for NOx. Prior to this test I have replaced (all since april) plugs, wires, cap/rotor. All oem spec parts from O'reillys, no performance parts. I recently installed new flowmaster 2.5" mini cats as well. maybe 150mi on the cats. Using a friends Matco Monitor 4000 Enhanced scanner, I retrieved the following codes last night after driving home approx 30mi hwy in 107+ temp. KOEO564- Fan control circuit failure KOEO ( I do hear both fan speeds come on during the test though...)181- Fuel system at rich adaptive limit at part throttle, system lean B1186- Injector pulse width higher than expected (with BARO sensor)  (BARO=barametric psi?)189- Fuel system at rich adaptive limit part throttle, system lean B2KOER-PASS and Cylinder Balance Test PASSAfter some google fueld semi professional amateur guestadiagnostics, I replace my O2 sensors with NTK sensors as a place to start. Drove home tonight, same mileage, approx 90* temp and pulled the following codes.KOEO 564 2xSEPARATOR 10Keep alive memory codes181 2xI then ran the fast codes option on the scanner and came up no codes. Re ran the slow code option and got a KAM codes PASS...which I thought was strange...KOER codes were172- Lack of heated Oxygen Sensor (HO2s-1) switches, indicates lean B1136- Lack of heated Oxygen Senosr (HO2s-2) switch during KOER, indicates lean B2CBT PASSI will clear the codes in the morning and go drive the car since I have not cleared the codes since installing the O2 sensors. I know high NOx is caused by high combustion cylinder temps, and I clearly have a lean eng condition, but I'm not sure how to correctly identify the exact cause.</blockquote>