I've been battling these codes persistently for some time now on my Mazda6 V6(essentially a Ford Duratec 30 with VVT). The codes mean lean conditions bank 1 and 2 respectively. It's always the same codes, but sometimes only the 2179(bank 2). At first they would appear every few months, but gradually have gotten much more frequent and appear every few days now. The car seems to drive fine otherwise. Maybe a little sluggish, which could be attributed to the change back to stock airbox, but idle is smooth, doesn't stumble during acceleration, etc.
About the intake. I had an aftermarket cold air intake on it that I had attributed the codes to at first, and since the CEL's were infrequent, I just cleared them with my scantool and went on my merry way. When they gradually became so frequent that they were becoming a PITA, I removed the CAI and put the stock airbox and filter back on. But, the codes are still there and are basically constant.
After finally learning some of the more advanced features of my scantool and studying the Mazda factory service manual, I'm leaning toward the opinion my MAF is bad. The freeze frame at the time of CEL showed my fuel trim high(~+20) and the MAF signalling way too much air entering engine(nearly 2 lbs/min at 1500 rpm). Unfortunately, my scantool doesn't read the MAF voltage so I have to go by airflow mass readings, which, according to the manual are high for a RPM essentially just off idle.
Just wondering if any of the experts out there could kindly offer their opinion.
About the intake. I had an aftermarket cold air intake on it that I had attributed the codes to at first, and since the CEL's were infrequent, I just cleared them with my scantool and went on my merry way. When they gradually became so frequent that they were becoming a PITA, I removed the CAI and put the stock airbox and filter back on. But, the codes are still there and are basically constant.
After finally learning some of the more advanced features of my scantool and studying the Mazda factory service manual, I'm leaning toward the opinion my MAF is bad. The freeze frame at the time of CEL showed my fuel trim high(~+20) and the MAF signalling way too much air entering engine(nearly 2 lbs/min at 1500 rpm). Unfortunately, my scantool doesn't read the MAF voltage so I have to go by airflow mass readings, which, according to the manual are high for a RPM essentially just off idle.
Just wondering if any of the experts out there could kindly offer their opinion.