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Hi, My my99 WRX has been throwing Check engine light on boost uphill lately. The car pulls alright doing 0-100 or wide open throttle in 2nd gear and 3 gear, but if I get it on boost a little bit when going uphill at highway speed(say 4th gear at 90kph over the harbour bridge), I get a check engine light every now and then. It started doing this 2 years ago, but now it's more frequent. I get code 23, 32 and 52 in diagnostic mode. The code 32 was always there, but the code 23 and 52 is new. The car drives fine off boost and I get 8L/100km on longer trips so I think the O2 sensor is alright, and the exhaust smells normal. The car smells a bit rich on cold start. I was under the impression those car use MAF on cold start, but only O2 sensor at operating temp, and then use both on boost to calculate AF ratio, so I kind of think the MAF is to blame for the check engine light? But how to explain the Check engine light only come up when on low boost for long period of time rather than on full boost? I have sprayed MAF cleaner a few times but it doesn't seem to help. I am running a cheap panel air filter with the standard airbox. The car is NZ spec with ej205 completely stock apart from sway bars, it has 280000kms on the clock, I am not driving the car until I fix the problem since I really want to get to 400000kms on this car without open the engine. Any thought guys? Thanks in advance.