P0053, now P0171 and P0174

[cashville]

I had the P0053 code, which is HO2S Heater Resistance (Bank 1, Sensor 1).
I bought 2 O2 sensors from New Global Automotive (http://www.ebay.com/itm/170884100778...4.m1497.l2649), and replaced 1 from each side (Bank 1 and Bank 2, although Bank 2 didn't point any errors, I went ahead and replaced it anyway).
I cleaned up the error with an OBD2 machine, but after about 10min I got the engine light again. I read them, and the error I get now is P0171 and P0174 (which are System Too Lean (Bank 1) and System Too Lean (Bank 2).

Before switching the sensors the 171 and 174 never showed up.

I don't know if these errors are coming up because the sensors are not OEM, or if they are showing up because the sensors are now reading the information correctly.

[hookandpull]

You could have leaking intake gaskets due to these codes or your fuel pressure is too low due to an intermittent fuel pump failure that just so happened to occur after you changed the O2's. Or your old O2's were not capable of giving correct AFR's.

My advice to you would be to reset your codes and install the old O2's back in and see if the problem follows. If it doesnt then the means two things

1. your new O2's could be faulty...

2. Your new O2's are actually correct and are capable of reading AFR's (where as your old O2's could not) to the point that you are indeed lean and need to further address either a vacuum leak after your MAF or your fuel pressure is low.

[HUMTECH]

The o2 heater code you had would have had nothing to do with exhaust gas readings, code sets for a faulty o2 heater only. If you replaced both pre cat sensors and are now getting lean codes i would suspect the new sensors. Put the old one back in bank 2 and clear codes. If you set a lean code on bank 1 then you have to blame the new sensors

[cashville]

I replaced them because on another thread, a guy told me that error (P0053) was the one he was getting, and he solved it by replacing the o2 sensors.

http://www.elcovaforums.com/forums/s...625#post547625

I will try what you said, and put the old one in bank2 and see if I only get the lean code on bank 1.

If that happens, I will put the old sensors back in, and should get the P0053 again. If that happens, what should I do to solve the o2 heater code?

[HUMTECH]

Then i would buy a factory sensor, more money i know but should fix the problem. Check wiring to sensor and make sure its not rubbed through somewhere causing the problem

[HUMTECH]