Hello everyone, I am with you with my S70 T5 98 model vehicle. I'm having a problem with my fuel values. When I look with the obd device, the ltft is in the range of -8 -14, sometimes these values ​​decrease when the weather is hot -4 -6 My vehicle is always running in a rich mixture. No fault codes appear. I changed the ignition, maf sensor, heat sensor, oxygen sensor to original bosch.

 

when you said "heat sensor" I assume you mean the engine coolant temp sensor (under the thermostat)? You can check the resistance cold and hot (google for resistance vs temp charts) of the ECT just to make sure its working - plus I'd inspect the wiring/cabling just to be sure.

Did you check fuel pressure and check for vacuum leaks?

 

yes I changed the ect sensor to Original. Thanks for your information, I will do a pressure test and resistance measurement.