P1053

Sorry for the typo. The DTC is P0153.

Well, no harm done, because nobody responded yet . But hopefully I got that DTC right now. P0153, P0153, P0153... Any takers?

The first step of the PPT directs you to perform a KOER test..... You could simply replace the sensor, but this is no guarranty of a fix.

Best advice... either cut to the chase and replace the sensor or follow the PPT EXACTLY.

If you were in my shoes.... you would catch flack for doing the PPT and then replacing the sensor and you would catch flack for replacing the sensor without performing the PPT (if the sensor didn't fix it). You cannot pick and choose which step you will perform next since the results of one test influence the next test.

Thanks, Jim.

KOER is not finding anything and the fuel trims are almost perfectly centered. But looking closer I found a 'pending' code for intermittent IAT output voltage. Seems to be poor contact to the PCM, because I can wiggle the connector and the IAT reading jumps. Probably nothing to do with the sluggish H2OS code, but perhaps there is one more pin with a poor contact there.

The fun continues...

I am the last one to throw parts at a problem, but compared to past struggles with oxygen sensors on other vehicles, the B2/S1on the Explorer was so easily accessible that I could not resist the temptation. By now the monitors have completed without a hitch and P0153 has not returned. If only figuring out that intermittent contact on the IAT connection had been so easy...

Hi there i have a 2000 ford explorer xls and was having the trouble codes come up for the oxygen sensor. I would clear the codes, 173 and 174 and upon driving it less than 2 miles the truck would hesitate and then the engine light came on again and i did a good inspection under the hood and was puzzled by the issue. I pulled all of the spark plugs out and bought new ones and set the proper gap and that fixed my problem. The book says that the engine was running to lean and to replace the sensor. I think the gap was less than .54 and it cause it not to get hot enough to burn the correct amount of air/gas artio so there thus causing my issue. Gray

x-no-archive: yes

Don't read too much into what the manual is telling you.... there are virtually no codes that tell us to change parts. They do lead us to test routines that *may* have us change parts. In the case of lean or rich mixture codes, we must first determine if the mixture is indeed lean or rich.

In your case, it sounds like faulty spark plugs were creating ignition driven misfires. Each misfire would send large amounts of unused oxygen down the pipe.... since the O2 sensor can only measure oxygen (and nothing else), the PCM would see this as a "lean" indication and result in a lean mixture code. One of the first steps in diagnosing DTCs is to determine if codes retrieved are causal or symptomatic.

HTH.