I have an engine misfire and the only fault code I have is Engine System running rich (Bank 1) fault code.
Hi all I drive a 2012 Opel Astra GTC 1.6T with 140000Km on the clock and with engine code "A16LET". This is a long story but will try to keep it short.
I have been having a misfire now for the last 5 months or so (when accelerating). I took it to a mechanic 2 months ago to run a diagnostic to see what the cause could be. He got a an engine vacuum fault code. He said the code was very vague and it is almost as if the computer did not know what was causing the vacuum leak. After further inspection he told me that my PCV valve was faulty (Which it was). After I changed my PCV valve the misfire continued. So I decided to buy a cheap OBDII scanner to see if maybe that would help me solve the problem. The only fault code I can see is a Fuel system running rich in Bank 1 fault code. After reading a few of the questions and answer from @jack62 on this forum I saw that it could possibly be my O2 Sensor. These are the readings I got from my scanner (I am really not sure how to read it or how to make sense of the information)
Any help or suggestions would be greatly appreciated. It could also be a faulty fuel injector but I am not sure how to test that. Could it still be a vacuum leak? or would the OBDII scanner have picked that up?
Thanks in advance.
Look it for vacuum leaks - It's a turbo engine so that's complex, but doable.
https://www.youtube.com/watch?v=zMok2y05jNE
There's also a method with starter fluid spray, to spray it around hoses and manifolds and see if the engine reacts.
(If it does, there's a vacuum leak there. but if it doesn't it doesn't mean there isn't a leak there)
Clean the MAF, MAP, Throttle, etc.
https://www.youtube.com/watch?v=xQGSkWEC_u4
Wait until the fuel system goes into CL (Closed Loop) mode and see if the O2 is still stuck.
O2S1 looks correct, the other one should also bounce between ~0 and ~1 - when the engine is hot.
It is important to use OEM / Denso parts, Chinese O2 sensors almost never work right nor for a long time.
If it stays stuck at 1.275V even in CL on a worm engine, that's probably wiring.
Consider disconnecting the battery to reset the ECU and make it relearn - probably won't help but worth a shot.
If nothing helps, Test the compression (piston destruction is common on Opel) and head gasket.
looking at your post history, it seems like your head gasket might be blown.
And at 140k km (87k miles) it's quite typical for an Opel - they are truly one of the worst.
These do require troubleshooting and trying things, so that's what I'd test.
