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Hi guys, I'm driving a Toyota Fielder and I've got a P2237 error which points to Bank1 sensor 1 open circuit. My mech suggested I change the rear O2 sensor at the exhaust pipe (before cat). From his experience, this is more commonly changed part than the AF sensor right after the exhaust manifold. Based on my understanding, I thought bank1 refers to the front sensor (AF) but anyway there were no stock for this part in all the stockists I checked (Min Ghee, Tye Soon, Fong Tat, Ric Tat) but I managed to find 1 last piece of the rear O2 sensor. It was quite cost but anyway since my mech says the rear sensor is more commonly changed and since my car is 140k mileage now, I decided to try it. Changed the O2 sensor but the CEL is still on, having the same P2237 error. So now I'm thinking of changing the front AF sensors since that's the only 2 so called O2 sensors in this car. I'm assuming my ECM and harness are all good (normally). The problem is that, none of the stockist carries this currently and I'm wondering if there are OEM replacements available. On google it seems Denso might have this AF sensor but I couldn't find any shops here that carries this range. Most of the shops carrying Denso products are for their AC.... Any idea from bros here if u have came across any shops selling Denso AF/O2 sensors?