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Hello.I have 2011 1.4 Turbo Cruze 160,000 Km. Australia. I bought it 4 months ago and 'CEL' has turned on since i bought it. After that I replaced a Ignition coil, Spark plugs, Top radiator Hose&Clamp(①Replaced Hose because of coolant leaking. ②Still leaking found, so replaced clamp. ③Still leaking ④WTF)Nevertheless some parts were replaced, 'CEL' keeps turning on. so Unavoidably I bought OBD2.Code is P0171. First thing what i did is Cleaning MAF sensor with MAF sensor cleaner..(also cleaned cable. and then i separated the battery terminal to reset the car's electronic system)Before and After cleaning MAF, MAF sensor value measured by OBD2 is perfectly 'SAME'. 1.5 g/s(RPM 700)Additionally there's two weired things what i find after cleaning MAF. ①The engine doesn't turned off when i pulled MAF sensor cable out from MAF sensor. ②While MAF sensor cable pulling out, a few seconds later, cooling fan starts working fking so fast. really high speed(still engine running, coolant temp 94ºC)!!??!?!?!?!?!? What the heck? Why the engine doesn't turned off and why cooling fans turns on? OMGI really wanna smash this car with hammer if i had one.
 

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By disconnecting the battery you done more harm then good. The obd2 will reset the light. No need to disconnect battery.

Drive the car for 100 miles then see what happens. The computer may need to relearn. Unless you were having these problems BEFORE disconnecting.
 

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Hello.I have 2011 1.4 Turbo Cruze 160,000 Km. Australia. I bought it 4 months ago and 'CEL' has turned on since i bought it. After that I replaced a Ignition coil, Spark plugs, Top radiator Hose&Clamp(①Replaced Hose because of coolant leaking. ②Still leaking found, so replaced clamp. ③Still leaking ④WTF)Nevertheless some parts were replaced, 'CEL' keeps turning on. so Unavoidably I bought OBD2.Code is P0171. First thing what i did is Cleaning MAF sensor with MAF sensor cleaner..(also cleaned cable. and then i separated the battery terminal to reset the car's electronic system)Before and After cleaning MAF, MAF sensor value measured by OBD2 is perfectly 'SAME'. 1.5 g/s(RPM 700)Additionally there's two weired things what i find after cleaning MAF. ①The engine doesn't turned off when i pulled MAF sensor cable out from MAF sensor. ②While MAF sensor cable pulling out, a few seconds later, cooling fan starts working fking so fast. really high speed(still engine running, coolant temp 94ºC)!!??!?!?!?!?!? What the heck? Why the engine doesn't turned off and why cooling fans turns on? OMGI really wanna smash this car with hammer if i had one.
Rather than smash the car, work on your diagnostic capabilities.

The code is telling you there is a large vacuum leak and, using this engines history, the burst disc that is part of the cam cover likely has ruptured.
Remove the coil cover and locate a circular cover with a small breather hole. Start the engine and note if there is any vacuum being drawn through that hole (usually accompanied by a whistle that stops when you place your fingertip over it).
If there is vacuum being drawn through it, it has failed and a cam cover replacement is called for.
Odds are though, you aren't done since this disc usually fails as a result of a check valve, located in the intake manifold, has broken away.
Search this site for photos of how to check or someone else will send a link.

Regarding the engine running/cooling fan on high.......by removing the wires from the MAF you are forcing the ECM into a fail safe, get home mode......it goes to base settings which includes enabling the cooling fan since it is trying to prevent engine damage.
This is a normal response.

Lastly, I am removing your other posts for the same issue......avoid cluttering the site please.

Rob
 

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