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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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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),...


Hello
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

I just need to know if there is anything special I should be aware of since these are antilock brakes. I am going to try and put new brake pads on myself since I have done so many times just never antilock...


they only thing you should be concerned about is the speed sensor and the wire connecting the sensor. they are in the vacinity of where you'll be working. other than that...same ol' same ol'

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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.

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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

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3 Answers

P0135 code


You have a broken wire at the connector for the 02 sensor. the brake may be inside the shielding.

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