Q: o2b1s1= 1.95 V , o2b1s2=0.70 V , P0420

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Hi Everyone .

Elantra 2010 , Live Data : FUELSYS1=CL FUELSYS2=-- LOADPCT(%)=17.3 ECT( F ) = 194 SHRTFT1(%)= -1.6 LONGFT1(%)=14.1 RPM(rpm)=666 SPARKADV(o)=5.5 IAT(F)=129 MAF(g/s)=2.45 TP(%)=4.7 O2SLOC B1S12--B2S---- O2B1S2(V)=0.760 SHRTFTB1S2(%)=N/A EQRATB1S1=0.978 O2B1S1(V)=1.95 EVAPPCT(%)=0.0 FLI(%)=9.0 EVAPVP(inH2o)=1.499 BARO(psi)=14.9 CATEMP11=CATEMP12(F)=749 VPWR(V)=13.968 LOADABS(%)=27.5 EQRAT=0.998 TP_R(%)=0.4

AAT(F)=87

Freeze Frame Data: DTCFRZF=P0420 FUELSYS1=CL FUELSYS2=-- LOADPCT(%)=50.2 ECT(C)=86 C SHRTFT1(%)=11.7 LONGFT1(%)=13.3 RPM(rpm)=2374 VSS(km/h)=100 SPARKADV(o)=22.0 IAT(C)=31 C MAF(g/s)=25.49 TP(%)=20.0 EVAPPCT(%)=94.9 FLI(%)=9.0 BARO(kPa)=103 kPa VPWR(V)=14.070 LOADABS(%)=82.0 EQRAT=0.995 TP_R(%)=19.2 AAT(C)=25 C

I Would be appreciated it if you could tell me that with data above specially when O2B1S1=1.9 V and O2B1S2=0.7 V and CATEMP11=CATEMP12=exactly shown same amount , Is it Catalytic converter problem or FUEL SYSTEM may LAEK?

My car has 100000 miles.
My car has an automatic transmission.

The upstream oxygen sensor appears to be out of range. The expected value should be between 0.2 and 0.9 volts with a frequency of 1 to 5 Hertz. Your report shows 1.9 volts. I would first look at a real time graph of the upstream oxygen sensor waveform. The downstream sensor voltage is on the high side. The LTFT is high and that could be indicative of a MAF calibration issue and/or a vacuum leak. The report shows a number of issues and I would suggest you request a check engine light diagnostic because a real time scanner will be needed to follow-up on what you have initially. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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