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Fuelsys1 Ol-fault

Changed out Airintake and trottleposition sensor, now I got a Fuelsys1 and 2 Ol-fault.. whats going on?

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I have a 2002 Toyota Solara 2.4L 4 cylinder. (Currently:199k miles) Months ago I got a P0420 code meaning I had a bad catalytic converter.. The code was reset multiple times to ensure the catalytic...

it is possible that you have been replacing the incorrect oxygen sensor
The O2 sensor is located after the cat converter and has little to do with fuel trim , air fuel ratio and the like
That is the domain of the HO2S ( heated oxygen sensor in the exhaust manifold before the cat converter) which reports on the exhaust gas composition to the ECM so that the mixture can be adjusted
Smelling fuel indicates leaking injectors which would also account for hard starts , idling problems

Feb 28, 2018 | Toyota Cars & Trucks

1 Answer

Engine seems to be running a little rough - OBD-II shows no codes, especially no misfire codes. Live data shows FUELSYS1 OL-fault and a red'X' for the EGR. Any ideas?? Bad EGR valve possibly??

Kevin, start by removing and cleaning EGR, you may have to replace.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

May 03, 2016 | Cars & Trucks

1 Answer

I have a 2002 mazda protege lx giving a P0300 code. scanner also says fuel system OL-fault, what do I need to look at?

Code 300 is for a random miss or loss of power which is tough to diagnose. Since you have replaced ignition parts, it could be an injector or fuel problem. Or a vac leak. Or a cam sensor, but usually a code would be set for the sensor too.

Feb 24, 2014 | Mazda Protege Cars & Trucks

1 Answer

My 2003 hyundai tiburon has a check egine p0171 ,

I hope you understand there have not been any
tune-ups in the last 25 years
You only get spark plugs ,that is all that restores
any sense of original engine tune ,so to speak

There are no air hoses either,you mean vacuum hoses

The PO 171 -- System too lean (Bank #1)

I will skip the long technical story & tell you to replace
just the front one or two, what are called up stream O2
Sensors in the exhaust pipe at the converter inlet
(oxygen sensors)

Change them on all your vehicles at 100,000 miles,that
way you don't have a failure & the dash light & codes,etc
you have now

You can get the sensors at any auto parts stores
Most people get parts at Rock Auto .Com
Brand Names & best prices

Sep 14, 2012 | 2005 Hyundai Tiburon

1 Answer

Having changed both lambda sensors the emission light still on any ideas what next

My corsa has had a LAMBA SENSOR fault so ive changed them, front & back, but with no joy, has anyone got any ideas could it be a ECU fault

Aug 26, 2012 | Cars & Trucks

1 Answer

Hello. I have a 2000mod space wagon 2.4gdi. The problem is that it wont rev over 3000rpm, uses 3 times more fuel as normal and runs like it is 70hk. Have changed spark plugs, airintake sensor (maf),...

The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM

Aug 24, 2012 | Cars & Trucks

1 Answer

Stalls upon deceleration

Is the check engine light on? Have any faults codes been read? Most autoparts stores will use a scan tool to read fault codes at no charge. The reason that I am asking is that it sounds like it could be the throttle position sensor or an emission control problem. (Catalytic converter, Oxygen sensor, etc.) Hope this helps. Good luck.

Jul 16, 2009 | 1997 Toyota Camry

1 Answer

2002Chevy trailblazer engine cuts off when heater & ac is on

remove the airintake boot and clean throttle butterfly with a rag and carb cleaner

Dec 03, 2008 | 2002 Chevrolet TrailBlazer

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