hello my friend from greece .after i sell my felicia.. i bought my skoda octavia 1,6 sr 8v avu 2002 model,with 265.000kmhs on odometer with lpg,, when i bougth it ,i change maf sensor, egr, spark plugs and all of the wires. crank and cam shaft sesor,fuel filter the car form the first day have a mis fire in all of the cylinder, in low rpms from idle to  4000 , when i go from 4500 jut before the limter no mis fire but the car lose a lot of poweer...with lpg or with the petrol car do miss fire

no check engine light on no  fault on the vcds,but.. today  after a lot of driving i see 1 fault, 16555 fuel trim, bank 1 system too lean p0171 35 10 intermittent,i clean it but nothing change,but its not the only problem.sometimes the throttle gets stuck,and need to press the accelerator to drop the idle in 600rpms if i put on the lights the idle goes to 1000rpm 900/1000.. when you hit the accelerator drop down to 600 and then again to 1000..if i put the ac on the car the egnine turn off ,there is a case for the throttle body need to replace? with another? or the ect sensor( engine coolant temperature sensor)? because i read in one forum in opel astra h. that this sesor make the car have a miss fires.on friend tell my to check the injectores and clean . tell me your opinion if anybody  has the same problem or had it 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ok, I know it has been two years, but maybe someone will find this thread searching for a solution.

 

I had almost the exact same issue with my Octavia (the only difference is that my engine is BFQ), 16555-P0171 "System Too Lean" and misfires on cylinders 3 and 4 in addition to that. The story was that I've encountered misfire on cylinder 4 at somewhat around 238K km, decided to replace spark plugs and wiring (which seemingly solved the problem at the time), and then after another 1000 kms my cooling system suddenly sprung a leak, so I left my car to fix it at Škoda service for three weeks (the replacement tube required for the fix was nowhere to be found on local markets, so I've had to wait for original one to be delivered straight from the factory in Czech Republic).

And after these three weeks I try to drive away from service station, and car is trembling and wheezing, stalls at every traffic light, "Check Engine" goes on and off in random fashion – not good. Was a stressful ride home. After a check-up, VCDS showed exactly the error aforementioned.

 

As it eventually came to be, the source of this issue were exactly my "new" spark plugs, bought a little on a cheap side and, as I was told by my mechanic, only had one electrode, while original VAG plugs have four. We've installed the original plugs and she drove like a charm again.

 

Hope this helps someone!