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Discussion Starter · #1 ·
Hi everyone

I’d love your advice. My 2003 Discovery II has already been a labor of love.
I got a P38 engine installed 1.5 years ago when my previous engine blew up.
Since then it has been working great. Never had any problems with it. Just did a 3k road trip, no issues at all. I took it in for a DEQ test and they couldn’t proceed due to various codes popping up. Took it into a garage and they told me it’s gonna need a big overhaul. Transmission specialist alone said I need to change the transmission for $3k. I’ve just had a newborn so money isn’t flowing, so any advice on which of these codes are a priority or not. As a reminder, it runs and works great. No slippage is obvious.
What am I looking at here?! Any advice on a Pacific North West (I’m in Portlandexpert for any of these (transmission and beyond). And advice on any of these I can fix myself (I’m an amateur but eager to learn)?

Transmission codes:
P0734 Gear 4 Incorrect ratio
(I’ve been driving this around town in manual to take the pressure off 4th gear). (Picture attached of the trans fluid color).


Engine codes:
P0154 O2 Sensor Upstream catalyst bank 2
(This has been a consistent problem. Engine light on constantly but was told it wasn’t a big problem)

P1000 (75) Catalyst Damaging misfire multiple cylinders
P1000 (70) Misfire Cylinder 8 With Cylinder Cutoff
P1000 Catalyst damaging misfire cylinder 8
P1000 (35) O2 Adaptive mixture correction TRA bank 2
P1000 (27) O2 Adaptive mixture correction TRA bank 1

P0172 Mixture Adaptation FRA bank 1
P1000 (249) Leakage Detection Module - leak detected

P0175 Mixture Adaptation Factor FRA bank 2
P0155 O2 Sensor Heater Upstream Cat Bank 2

Would love your advice. I love this vehicle so much. I expect to pay to keep it running. I know it’s worth the time and attention. Thanks
Sam




92354

92355
8A07A46B-534D-413E-8D0E-78478B648CD0.jpeg
 

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I would probably address these issues one at a time. The misfires could be bad wires and plugs; have they been replaced?

Looks like you need at least one O2 sensor.
 

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Discussion Starter · #3 ·
Thanks for your reply. I’m not sure if they have been replaced but I’m going to attempt to replace them. Any particular coil packs, wires and plugs you’d recommend?

I also need to know where to get a MAF sensor from.

thanks for your Advice
 

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Yes the MAF sensor can cause all those engine management codes, get only Bosch or genuine LR don't use cheap aftermarket,
google out MHK100800LR or Bosch 0 280 218 010

that transmission code means that output shaft speed sensor input is out of the expected range in 4'th at a certain calculatd engine torque... if the MAF is faulty this can be the root of this code too cos actually the torque is not as expected so it doesnt match with the output shaft and engine speed as it's mapped in the ECU especially if you have much bigger than standard tyres... you need a dedicated diagnostic tool to reset the autobox addaptive values
 
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