Replaced O2 sensor: still get PO134!!
 

I replaced both O2 sensors a year ago, along w/catalytic converter. Passed state inspection and was fine for a few months. Then "CHECK ENGINE SOON" light comes back off and on. Then just stayed on so..... replaced front O2 sensor (this time w/Denso) along w/PCV. Light stays off 15 miles then boom "CHECK ENGINE SOON" comes back on. Codes are PO134 and P1133. Help!!! No overheating ever (even though I'm in El Paso, TX), but should I try changing ECTS?

Maybe you'll learn to buy the 02 from the dealer next time, and if you plan to replace the "ECTS and connector where do you think you should buy that ...... A hint, Not CheckerAdvanceZone or PetesPartsAndPita's

What SW2cam is trying to say (in his own delicate manner), is that after-market parts may look the same, and cost less than OEM parts, but they don't always work (or last) nearly as well or as long.

^^^THIS
OEM or nothin....