For the past 3 months i have had CEL 21 & 21 (O2 sensors).
I just bought a Bosch O2 sensor for $70.00 at autozone, installed it, reset the computer, and the 21's go way.
But CEL code 51 shows up. Can anybody please help me fix this or explain why it happened. It has somthing to do w/ "fuel system lean". I am clueless, please help, selling my car. Thanks
Try making sure your o2 sensor connections are on tight. And read the sensor itself. I think it might mean the o2 sensor is telling the ecu that your car is running lean (low max voltage at WOT). I think at WOT it should be 0.88volts or higher...
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2004 WRX - WR Blue Pearl 1997 Eclipse GS - Royal Sapphire Pearl
Possibly it is just an issue with the fuel trims. Leave it be for a while, then reset the ecu once more and see if code 51 goes away.
21 is probably for the rear o2, since the front one was replaced.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
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