Hi.
I see that you have helped someone else with the p0153 CEL code. I have the same problem. I appears as if the O2 sensor is easy to replace ONCE YOU CAN LOCATE IT! I am a complete newbie and am not sure where it is located? I have a 1996 Ford Ranger XLT. I will check under the hood. Is there a website/webpage that has a diagram of where they are located?
Thanks!
Originally Posted by Rockledge
Well, normally when I see a P1151 code I would remind people that an O2 sensor indicating lean doesn't necessarily mean that there is anything wrong with the sensor ...instead, it can indicate that there is some kind of vacuum or exhaust leak, or fuel delivery issue etc. which is creating the lean condition.
However, since you are also getting the P0153 code, that tends to lend more credibility to the theory that the Bank 2 "upstream" sensor itself (or the circuit) is bad. But you still ought to look over the engine bay for any possible leaks in the vacuum lines, check also the PCV and EGR systems and hoses, and look for any exhaust leaks on Bank 2 (driver's side).
If you decide to replace the O2 sensor, think about spraying it down well beforehand with a good penetrating oil. You can buy or rent a special O2 sensor socket from most auto parts stores, but it's not absolutely critical. Don't forget to take off the cable from the negative battery terminal and to unplug the O2 sensor's harness connector before you start wrenching it. You'll want to put a little anti-sieze compound on the threads of the new sensor if they don't already come with it applied.