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Trung Phung
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Trung Phung

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I have the toyota solara 07, the second piston compression is 120 PSI , the others three are the same 160 PSI.  can  this second low piston compression cause code P0171? Please help!
nick worsham's profile photoScotty Kilmer's profile photo
it could cause that, but really, being THAT low, engine needs rebuilding
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Trung Phung

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I have toyota solara 07'   4 cyl  .  I have 02 codes which come up are P0171 ( which jump up first ) then drive test about 10 miles it cause extra P0441) . I believe the main problem is "Code P0171". Here is the freeze frame data , please help me to find out what is the problem :

Trouble code    P0171
that cause freeze frame

ABSLT TPS                          15.3%
( Throttle position)
Engine Speed                     798 RPM
Baro PRS                             29.2”HG
( Barometric pressure)
 CalC Load                          29.4%
(calculated engine load)
MAF                                     0.41LB/M ( Mass Airflow sensor)
Coolant                               178 DegF( Engine Coolant temp)
IAT                                       46DegF ( Intake Air Temp)
IGN ADV                             10.0 Deg
( Ignition timing advance)
ST FTRM1                           19.5%
( Short term fuel trim bank 1)
LT FTRM1                           30.5%
( long term fuel trim bank1)
VEH Speed                            0 
ABS load                             16.1%
( Absolute load value)
Fuel System 1                    Closed
Fuel system 2                     N/A
Throt CMD                         15.3%
( Commanded throttle Actuator control)
ABS TPS B                           46.7%
( Throttle position B)
ACC POS D                          14.9%
(Acclerator Pedal Position D)
ACC POS E                          31.4%
CAT TEMP11                      1242 DegF
(catalic converter temp bank1)
CAT TEMP12                      1070 DegF          
(catalic converter temp bank3)
EVAP PURGE                      0.0%
(Commanded EVAP Purge)
EVAP VPA                           401.8H20
( Absolute EVAP Vapor Pressure)
CMD EQ RAT                      0.997
(Commanded Equivalence Ratio ( Rich / Lean)
02S B1S2                             0.035V
( O2 sensor Bank 1 , Sensor2)
02SB1S1                              3.427V
O2S B1S1                            0.078mA
( O2 sensor bank1, sensor1)
Eq Rat B1S1                       1.033
( Equiv Ratio Bank1, Sensor1)
VPWR                                  14.003V
(Control module voltage)
 Appreciate for your help!
Scotty Kilmer's profile photo
that's running lean, over a dozen different things can do that, from vacuum leaks to bad fuel injectors to clogged cats.  Not a easy diagnosis
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