Technical Errors P0170 and P0130 Bravo 1.2 1999

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Technical Errors P0170 and P0130 Bravo 1.2 1999

maxmad

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I had a hole in the exhaust and i received the following errors:

P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

and
P0170 - Fuel Trim Malfunction (Bank 1)

after i fixed the hole (brand new exhaust before 6 months ago) i received only P0170.

Now i receive both of them again!
I didn't check for a new hole but a don't think so.
I have also high levels of
HC (Hydrocarbon) at exhaust emissions...

Is there any idea what to look?

injectors? O2 sensor? Catalytic converter maybe? or any other engine sensor?
 
I am almost sure injectors on 1.2 engine are ok. These two errors can be interconected. P0170 - Fuel Trim Malfunction says ECU adaptation is not working. In your case most probably because ECU gets unusable lambda signal. You can measure lanbda resistance. In general ECU ignores lambda before engine reachs operational temperature. So if you get error codes from cold start, I assume it is fault in circuit. Take a look on connectors first, connector for fuse-box, lambda fuse and wiring
 
I will check if errors occurred at cold start.

What is the expected ohm value for lamda?
 
I'm having those codes also. Haven't figured out how to fix the problem. Haven't checked for exhaust leaks tho. I tried to check leaks on intake side and couldn't find any. I changed lambda (like 1y ago) when I received those codes first time. Didn't work :(
 
Oh. Forgot to reply :)
Actually managed to fix P0170 code. I measured lambda-connectors and noticed that ground had 0.2V (doubt that's normal(?)). So I grounded lambda to block. Haven't figured out P0130 yet, but at least P0170 is gone .
 
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