Guest Posted November 19, 2020 Share Posted November 19, 2020 Persistent EML light comes on and my JOBD reader said it was fault code P0174 fuel trim to lean (bank 2). My supplying dealer insisted it was the rear lambda sensor and sent one out to me, today it was fitted locally and within 10 miles the EML came on again and fault code was the same one. Anybody got any other suggestions? Quote Link to comment Share on other sites More sharing options...
GB57 Posted April 18, 2021 Share Posted April 18, 2021 On a 3.0 litre, maybe Bank 2 refers to the front bank ( I don't know for sure but it's a possibility ) . There is an O2 sensor on both front and rear manifolds. Best practice says change both at the same time even if one is ok. Quote Link to comment Share on other sites More sharing options...
Guest Posted April 18, 2021 Share Posted April 18, 2021 Thanks, I had the other one done too but still the EML comes on, I've taken to covering it up as the car drives OK. Cheers for the comment. Quote Link to comment Share on other sites More sharing options...
Gruf Posted May 1, 2022 Share Posted May 1, 2022 Afternoon Colin, just checking on past postings regards EML. Did you ever get this problem sorted, as I have the same problem and looking for possible problem solutions. Thanks Barry Quote Link to comment Share on other sites More sharing options...
Guest Posted May 1, 2022 Share Posted May 1, 2022 Hi, I took it back last July to the supplier and they replaced the Mass Air Flow sensor for me, ever since then its been fine. Quote Link to comment Share on other sites More sharing options...
Gruf Posted May 1, 2022 Share Posted May 1, 2022 Hello Colin, thanks for the fast reply I will keep that in mind. Thanks Barry Quote Link to comment Share on other sites More sharing options...
Picasso Posted June 22, 2022 Share Posted June 22, 2022 I know thread old now but I was having same problem p0174 and p0171 I changed maff sensor aftermarket this made it worse I was told by the garage I bought alphard off never put aftermarket maff sensors on so I purchased a genuine one from toyota cost £107.00 all in with shipping if you buy direct from toyota UK you will pay £185.00 + vat so a big saving if you want to know where I got it from pm me. By the way both codes relate to same fault maff sensor mine all sorted now. 1 Quote Link to comment Share on other sites More sharing options...
Alphard Club Posted June 23, 2022 Share Posted June 23, 2022 You will also find that the rear sensor will more than likely play up if the vehicle has LPG. Been there. Needs a mechanic with arms to get right up from under the car. Mechanic i had stuck his up up there even with the car still hard.. hard as nails that bloke. Quote Link to comment Share on other sites More sharing options...
Gruf Posted June 24, 2022 Share Posted June 24, 2022 Just to let you know that I purchased a new MAF module and installed this the following weekend. Drove it to work the next day, a round trip of 50 miles and evreything has been good. Clocked up another 2000 miles since replacing the MAF and all is good. Changing the MAF was easy as long as no one has damaged the two small screws holding it in location. Thanks Gruf Quote Link to comment Share on other sites More sharing options...
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