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2001 Nissan Sentra 1.8. PO171-174 code. Tested and replaced…

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2001 Nissan Sentra 1.8. PO171-174...
2001 Nissan Sentra 1.8. PO171-174 code. Tested and replaced MAF sensor, Have good fuel pressure, Can not find any vacuum or intake leaks, Tested all 4- 02 sensors and appear to be working. Have also replaced coil packs and plugs that were bad. any other advice? Also previous owner straight piped the cat, could this cause code , was there a 02 sensor after the cat on this car
Submitted: 1 year ago.Category: Nissan
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Answered in 7 minutes by:
7/28/2017
Nissan Mechanic: Wolfgang, Master Auto Tech replied 1 year ago
Wolfgang
Wolfgang, Master Auto Tech
Category: Nissan
Satisfied Customers: 5,252
Experience: Master, L1, L2, ASE 15yrs and running.
Verified
Hello I'm Wolfgang. Is that the only codes stored?
When the a/f sensor was replaced did you recalibrate the ecu ?
Thanks
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Customer reply replied 1 year ago
No, do you have a link to the process, I have seen one that was detailed and took up to 500 miles to complete.
What is your opinion on the missing cat and did this model have a 02 sensor after it
Nissan Mechanic: Wolfgang, Master Auto Tech replied 1 year ago
You will need the cat converter and it does have the rear o2 sensor.
You will need a professional scanner to reset the ecu.
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