My code is p02270 stuck. we changed all the o2 sensors and checked wired no exhaust leak. i don't know what it could be.
Jun 22, 2020 at 3:20 PM
Check engine light and code p02270
2007 MERCURY MILAN
KEMPLIN1
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4DRTOM
- ✓ASE Certified Mechanic
- 467 POSTS
Hello,
Assuming that you cleared all the codes after changing the sensor and the code came back. This code is essentially saying there is to much air post catalytic and the sensor output is 0 volts. Commonly an exhaust leak. Seeing you've checked for that and the wires are fine and the new sensor is nice and tight then other causes could be faulty fuel pressure or injector. the purge solenoid valve could be acting up as well. It could also have coolant getting where is doesn't belong. How did the old sensor look did it have contamination on it? How about performance, is it running rough?
Tom
Assuming that you cleared all the codes after changing the sensor and the code came back. This code is essentially saying there is to much air post catalytic and the sensor output is 0 volts. Commonly an exhaust leak. Seeing you've checked for that and the wires are fine and the new sensor is nice and tight then other causes could be faulty fuel pressure or injector. the purge solenoid valve could be acting up as well. It could also have coolant getting where is doesn't belong. How did the old sensor look did it have contamination on it? How about performance, is it running rough?
Tom
Jun 22, 2020 at 9:01 PM
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