dhayzen

Hi Folks,

Could anyone shed any light on the following for me please ?

Over the past few weeks my Check Engine light comes on during driving.

Now what I have noticed is it comes on under the same conditions every time.
It happens when I'm going up a long steep hill. Then when I go back to flat and brake, or go downhill the light goes out again.

My brain is saying this is fluid related, as I go up the hill all fluids are going towards back of engine. Going flat and braking makes them return to the front or equal across engine.
I have checked all fluids, and found that the oil was a bit low, so topped that up but problem still persists.

I have tried to read fault code, but non reported because soon as I turn off the ignition with the check engine light illuminated, then it has gone out when I turn ignition back on.

The engine doesn't suddenly 'change' in performance, feel or sound.

Has anyone experienced this or got any ideas as to what it could be ?

A most confuzzled Dave.

Jolly Green Monster

iTrader: (4)

The error code will still be in the history, read the codes

dhayzen

Ok, thanks for the that Jolly Green Monster. I shall go and check now and come back to you.

dhayzen

Ok, got an error code.
It is number 32.

Deepee74

Isn't that the Standard Oxy Sensor Code ?

beezor

iTrader: (1)

thats the error code 4 the oxygen sensor mate

dhayzen

I am assuming as the code 32 is repeating that this means it is the only fault code in the history since the ECU was last reset. Is it worth doing an ECU reset and see if it does it again just incase this is an old error code ?

Is the oxygen sensor something I can change easily? Or best to get a dealer to do it?

Deepee74

I know this sounds really Basic and not wanting to be patronizing, have you checked all the Levels, it seems funny that it only happens going up Hill ?

beezor

iTrader: (1)

reset the ecu and c if u still get an error code-if still oxy sensor its easy 2 replace on my car(95 wrx)-its by the exhaust manifold heatshield but i think its fair 2 say that if u have a prob with your car and u r getting an error code then its a fair place 2 start

beezor

iTrader: (1)

i know wot u mean-its funny symptoms 4 a failed oxy sensor but.......

Deepee74

List of Subaru Codes from SIDC

1 Engine Speed Signal Circuit
11 Crankshaft Position Sensor
12 Starter Signal
13 Camshaft Position Sensor
14 Fuel Injector No. 1 (Legacy, Impreza, Justy, SVX)
15 Fuel Injector No. 2 (Legacy, Impreza, Justy, SVX)
16 Fuel Injector No. 3 (Legacy, Impreza, Justy, SVX)
17 Fuel Injector No. 4 (Legacy, Impreza, SVX)
18 Fuel Injector No. 5 (SVX)
19 Fuel Injector No. 6 (SVX)
21 Engine Coolant Temperature Sensor
22 Knock Sensor
23 Mass Air Flow Sensor Circuit
24 Idle Control System Malfunction
24 ISC Valve (Stick)
24 Open/Short in ISC Valve Circuit
26 Intake Air Temperature Sensor
27 ATF Temperature Sensor Circuit
28 Knock Sensor #2
29 Crankshaft Position Sensor 2
31 Throttle Position Sensor Circuit
32 A/F Sensor #1 System
32 A/F Sensor #2 System
32 Oxygen Sensor
33 Vehicle Speed Sensor
35 CPC System
36 Turbine Speed Signal
37 Rear O2 Sensor Circuit / A/F Sensor Circuit Malfunction
38 Torque Control Signal #1
38 Torque Control Signal #2
38 Torque Control Signal System
38 Torque Permission Signal
39 Traction Control System
41 Air/Fuel Adaptive Control
42 Idle Switch
43 Accelerator Pedal Switch
44 Turbocharging Pressure Control Signal
45 Pressure Sensor
46 Neutral or Parking Switch or Circuit
47 Fuel Injector
48 Lean Burn System
49 CO Resistor
51 Neutral Position Switch
52 Parking Brake Switch (Exc. Justy)
53 Antenna
53 Anti-Quick Operation Mode
53 Communication Error (Time Over)
53 EGI Control Module EEPROM
53 IMM Circuit Failure (Except Antenna Circuit)
53 IMM Control Module EEPROM
53 Key Communication Failure
53 Reference Code Incompatibility
53 Use of Unregistered Key
54 Air Intake System
55 EGR Valve Lift Sensor
56 EGR System
57 Canister Control System
58 Air Control System
61 Air Suction Control Solenoid Valve
62 Exhaust Manifold Valve Negative Pressure Control Solenoid
64 Relief Valve Control Solenoid Valve 1
64 Relief Valve Control Solenoid Valve 2
65 Differential Pressure Sensor
66 Twin Turbocharger System(H)
66 Twin Turbocharger System(S)
66 Twin Turbocharger System(T)
66 Two Stage Twin Turbocharger System
67 Exhaust Manifold Valve Positive Pressure Control Solenoid
68 Turbocharging Pressure Control Output Signal #2
71 Shift Solenoid Valve
72 Shift Solenoid #2 Circuit
73 Low Clutch Timing Solenoid Circuit
74 Brake Clutch Timing Solenoid Circuit Malfunction
75 Line Pressure Duty Solenoid Circuit
76 Brake Clutch Pressure Duty Solenoid Circuit Malfunction
77 Lock-Up Duty Solenoid Circuit
78 Tiptronic Solenoid System
79 Transfer Clutch Duty Solenoid Circuit
81 Torque Up Control Valve
85 Charger System Circuit Malfunction
86 CAN (Communication System)
87 Variable Induction Solenoid Valve Circuit Malfunction
88 Fuel Pump Circuit Malfunction
89 VVT Systems (L)
89 VVT Systems ®
91 TCS Relief Valve
92 Electrical Generation Control Signal Circuit Malfunction
93 Vehicle Speed Sensor #1 Circuit
94 Lateral G Sensor Signal Circuit Malfunction

Deepee74

And THIS page shows the codes as shown on the OBDII system

Deepee74

Sorry Should have checked what MY is it ?

dhayzen

Ok, I'll try an ECU reset now and run it for a few miles and see what happens....

Thanks for all your help, will let you all know a little later on...

Dave

dhayzen

MY is MY00

richgreenscooby1

iTrader: (2)

hia mate i had exactally the same problem ,
but its worth checking the o2 sensor white connector , one of the pins was coroded in mine , cleaned up with contact cleaner , reset ecu and fixed it check that first

dhayzen

Done an ECU reset and still have the fault code 32.

What is weird though... if a fault code is present, why isn't the Check Engine Light on all the time ? Or is this normal behaviour ?

Thanks richgreenscooby1 for your advice re connector, i shall take a look tomorrow.

One last question. As the Check Engine Light is not on, do I need to sort this now or could it wait until next service? Is this going to damage anything by this sensor not working correctly ?

Deepee74

The o2 sensor is partly responsible for your engines fueling, Sensing the amount of Hydrocarbons in the exhaust and adjusting the fuel Mixture accordingly, so if working incorrectly could Over/Under fuel your engine which could cause problems.

scoobyboy

and as you load up the engine when you go up a hill thats why the light comes on it's all to do because the fuelling is wrong

Deepee74

dhayzen,

Any news m8 ????