its on my check list but hitachi maf are not prone to fail

 

ok so all wire and voltage check coolant sensor look fine to me did boost leak, intake pipe leak etc all fine.....
unpluging maf will stall engine
did a log :

http://datazap.me/u/mike/open-loop-s...=0&data=2-3-20

you can clearly see afr bouncing up to 1.5 to 5 lol and fuel trim not going close loop (stuck open)
still p0130 and p0155 cell

 

Did you check the fuel pressure with a gauge at the fuel filter port?

 

thx JP will check it tomorrow and report

 

problem solved! i cleaned the air filter,reconnect the dme , reflash the dme... maybe a loose wire at the dme or bug in the flash (force not to close loop)
now car run like a champ with better fuel trim (maybee new 02 sensors)
hope this thread can help people ...
very special thx for JP

 

Hey guys bringing back this thread for others to chime in if they’ve seen these codes.

I’ve been getting the P0135 and P0155 O2 sensor heater circuit codes for both banks, pre-cat O2 sensors. I've been through 2-sets of Bosch O2s, verified my wiring per the Porsche procedure posted, even got my ECU sent to ECU Doctors to be tested good and swapped out to test with another ECU and I'm still getting the same P0135 P0155 O2 sensor heater circuit codes.

Checking to see if anyone has other ideas for me to check.