Hey all, I was wondering if anyone has had similar problems. I have a XC90 T8, MY2017 (early 2017), Polestar. I'm at 125k kilometres (77k miles), and am always asking a lot from the engine. After some wonderfull troublefree years (if I skip the whole ERAD-replacement 2 years ago), there are some problems coming up:
1) My check engine light came on recently, checked, turned out to be the code P0171 - System too lean on bank 1 (too little fuel or too much air).
It comes and goes, it might be triggered by the fuel I tank (normally I tank Shell Vpower, octane 98, 0% ethanol - I saw the CEL came on twice shortly after I tanked another octane 98 with 5% ethanol). Still, it should not trigger of course by just 5% ethanol - but it might be that for example the O2-sensor is just slightly off, and thus as a first sign the system triggers when the fuel is just a little less energetic (wishfull thinking)
2) I always loved the "Oomph"-sound the engine/turbo made at the end of each short acceleration the moment the transmission changes... Easily triggered by short acceleration from for example 30 tot 70km/h, and then releasing the gaspedal. Haven't heard the sound though for the last few weeks, normally I would hear it at least a few times day! I checked the boost-pressure while driving, if I press the pedal it will instantly rise to about 18.5PSI, and then slowly build up all the way to 22.5PSI (which is just about right for Polestar T8); However, 22.5PSI is only reached after like 8 seconds of acceleration, when I'm driving around 160km/h (100mph). Shouldn't it be reached way earlier? Is my turbo/supercharger failing or leaking, perhaps? Might explain the CEL as well.
3) The transmission is sometimes stuttering - if I coast at around 80km/h (50 mph), just at the turnover between 2 gears, it can jitter a bit; The same can happen when it downshifts when decellerating, it gets 'jerky'. Also, when going over a speedbump, the engine keeps engaged to the weels, meaning that due to the 'wobble' introduced by going (slowly) over the speedbump, the car is engine-braking the wheels... Thus leading to a bit of boat-feeling. I can't remember that I've felt that before (might be seeing ghosts, always happens when you are doubting your car for other reasons
)
Anyone who has experienced the same with either a T5/T6 or T8?
Disclaimer - the car is at the dealer today. Love those guys, really helpfull, but as we all know there is a very big change that I first have to see if a software reset might fix my troubles...
1) My check engine light came on recently, checked, turned out to be the code P0171 - System too lean on bank 1 (too little fuel or too much air).
It comes and goes, it might be triggered by the fuel I tank (normally I tank Shell Vpower, octane 98, 0% ethanol - I saw the CEL came on twice shortly after I tanked another octane 98 with 5% ethanol). Still, it should not trigger of course by just 5% ethanol - but it might be that for example the O2-sensor is just slightly off, and thus as a first sign the system triggers when the fuel is just a little less energetic (wishfull thinking)
2) I always loved the "Oomph"-sound the engine/turbo made at the end of each short acceleration the moment the transmission changes... Easily triggered by short acceleration from for example 30 tot 70km/h, and then releasing the gaspedal. Haven't heard the sound though for the last few weeks, normally I would hear it at least a few times day! I checked the boost-pressure while driving, if I press the pedal it will instantly rise to about 18.5PSI, and then slowly build up all the way to 22.5PSI (which is just about right for Polestar T8); However, 22.5PSI is only reached after like 8 seconds of acceleration, when I'm driving around 160km/h (100mph). Shouldn't it be reached way earlier? Is my turbo/supercharger failing or leaking, perhaps? Might explain the CEL as well.
3) The transmission is sometimes stuttering - if I coast at around 80km/h (50 mph), just at the turnover between 2 gears, it can jitter a bit; The same can happen when it downshifts when decellerating, it gets 'jerky'. Also, when going over a speedbump, the engine keeps engaged to the weels, meaning that due to the 'wobble' introduced by going (slowly) over the speedbump, the car is engine-braking the wheels... Thus leading to a bit of boat-feeling. I can't remember that I've felt that before (might be seeing ghosts, always happens when you are doubting your car for other reasons
)Anyone who has experienced the same with either a T5/T6 or T8?
Disclaimer - the car is at the dealer today. Love those guys, really helpfull, but as we all know there is a very big change that I first have to see if a software reset might fix my troubles...
