OBD II Codes - what do these mean? - Land Rovers Only

////MPower · 12-14-2005, 07:14 PM

Hello all you range techs! The Disco II is throwing the following codes
6525
0734
0007
9800
I bought a cheap OBD II code reader off eBay, and these are the numbers it shows. It cleared them once, and I rechecked when it threw the check engine light again.... all four codes.

Only one shows up in the OBD II code book (0734 incorrect 4th gear ratio???)

What do these all mean???????????

////M

Rovin4life · 12-15-2005, 11:02 AM

you got some screwed up codes.

the only one that we commonly see is the 0734 its associated with the lean codes thrown by a bad MAF.

I bet five bucks its a MAF sensor.

////MPower · 12-15-2005, 07:26 PM

Quote:

Originally Posted by beezel

you got some screwed up codes.

the only one that we commonly see is the 0734 its associated with the lean codes thrown by a bad MAF.

I bet five bucks its a MAF sensor.

Beez the truck runs great, what are symptoms of a bad MAF? It passed emissions a month ago and it has a great idle and at all throttle positions.

99 model with 57,000 kilometres or 37,000 miles or so.

Disco Mike · 12-15-2005, 10:29 PM

When it fails, the transmission tends to shift a little differently, you may smell rich exhaust and can hesitate from a stop. My 99 has the same problem, luckily the unit is not too expensive.
Mike J.

roverX · 12-15-2005, 10:35 PM

Try to clean it first.

////MPower · 12-16-2005, 04:12 PM

Thanks you guys!
I will get a real mechanic to put a higher quality OBD code reader on it and I will post the results for all to see!

////MPower · 12-20-2005, 01:11 PM

as an fyi:

on a snap-on diagnostics device, the 0734 code came up... fourth gear out of ratio!

still no explanation what that means but it goes to a shop next week for a guru to diagnose and explain.

////M

////MPower · 12-21-2005, 07:10 AM

I found a thread on Discoweb, and a cleaning of the MAF may be in order. Strange but true, and I will post the results to see if the clean MAF element will clear the code once and for all.

////M

Disco Mike · 12-21-2005, 09:57 AM

////M
I have a one code for a MAF failure, went out and got some good contact cleaner from Radio Shack. It did clean all the crude from the sensor, improved the power but I still have a flat spot from a stop and some shifting problems and I can still smell some bad exhaust all of which is typical with a bad MAF.
By the way, cleaning or replacing will not turn off the check engine light, you'll still need a scanner.
The good new is Atlantic British has a good price, around $140, for a new MAF.
Mike J.

darkknight1999 · 12-21-2005, 08:09 PM

Its the sensor. I had the same thing. If you try and clean it be very careful. Use a good electronics cleaner.

////MPower · 12-22-2005, 03:58 PM

Well another check showed 8007, 8104, 9200, 6521 and 1400. (no 0734)
Weird, only the 1400 code mase sense and if it was 0104 it would be a MAF.
I started to look for a crack in the intake.

Well I took the entire intake apart. Banged out the air filter and a cloud of dust came out. The snorkel behind the MAF was damp with the combustion chamber/throttle body cleaner I used last week and the barrel shaped reservoir attached to it had a bunch of dirty fluid that had run down and pooled in it from the cleaning. (my carelessness)
Took the MAF off and sure enough you can see the microfine dust particles that make it past the air filter. On the hot-wire you could see the discoloration from the accumulation of brown dust, as well as in the channel the air runs through past the wire. (very slight but a light covering)

I cleaned the wire CAREFULLY with electronic contact cleaner and wiped as much dust off the entire MAF as possible.

I also found a wee split in the plastic where that reservoir attaches to the neck of the intake tube. I glued and ran a bead of silicone around the seal.

So far so good, no codes and it still runs beautifully. Wish us luck!

Thanks for the help with code 0734 !!!!!!!!!!!

////MPower · 12-31-2005, 03:35 PM

The consensus from a few mechanics is that the computer thinks the third to fourth shift might be sluggish at some point.... throwing the 0734. No luck with the MAF sensor, it just runs even better and smoother now!

////M

darkknight1999 · 12-31-2005, 05:41 PM

Did you ever replace the MAP sensor?

////MPower · 12-31-2005, 08:30 PM

The truck only has 57,000 km (38,000 miles).
I cleaned the hot wire on the MAF and it is perfect. The truck runs perfect and I mean, perfect.
Maybe when I can see what all it takes for a dealer service I might have the tranny fluid changed and make sure the latest software is in the computer. It might just be a glitch.

////M

12-14-2005, 07:14 PM	#1 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	OBD II Codes - what do these mean? Hello all you range techs! The Disco II is throwing the following codes 6525 0734 0007 9800 I bought a cheap OBD II code reader off eBay, and these are the numbers it shows. It cleared them once, and I rechecked when it threw the check engine light again.... all four codes. Only one shows up in the OBD II code book (0734 incorrect 4th gear ratio???) What do these all mean??????????? ////M

12-15-2005, 10:35 PM	#5 (permalink)
roverX Elephantitis penisitis Join Date: Apr 2005 Posts: 5,439 Gallery: 0	Try to clean it first. __________________ What? Is this where I'm supposed to write some profound statement that boggles the intellect of the genius that you think you are? Why would I waste my time with that when I can be getting free lap dances from your sister AND your girlfriend at the same time?

12-20-2005, 01:11 PM	#7 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	update as an fyi: on a snap-on diagnostics device, the 0734 code came up... fourth gear out of ratio! still no explanation what that means but it goes to a shop next week for a guru to diagnose and explain. ////M

12-21-2005, 07:10 AM	#8 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	Dirty MAF? I found a thread on Discoweb, and a cleaning of the MAF may be in order. Strange but true, and I will post the results to see if the clean MAF element will clear the code once and for all. ////M

12-21-2005, 08:09 PM	#10 (permalink)
darkknight1999 Mod. --- I'm watching you Join Date: May 2005 Location: Linwood, MA Posts: 330 Gallery: 0	Its the sensor. I had the same thing. If you try and clean it be very careful. Use a good electronics cleaner. __________________ -John Some of my favorite quotes: "what you do in life, echo's in eternity..." "death smiles at us all... all a man can do is smile back..." 1999 Discovery II SE-7

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12-15-2005, 11:02 AM	#2 (permalink)
Rovin4life Former NAS LR TECH, Current AUS LR TECH Join Date: Oct 2005 Location: DOWN UNDER Posts: 1,884 Gallery: 0	you got some screwed up codes. the only one that we commonly see is the 0734 its associated with the lean codes thrown by a bad MAF. I bet five bucks its a MAF sensor.

12-15-2005, 10:29 PM	#4 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	When it fails, the transmission tends to shift a little differently, you may smell rich exhaust and can hesitate from a stop. My 99 has the same problem, luckily the unit is not too expensive. Mike J.

12-16-2005, 04:12 PM	#6 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	Thanks you guys! I will get a real mechanic to put a higher quality OBD code reader on it and I will post the results for all to see!

12-21-2005, 09:57 AM	#9 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	////M I have a one code for a MAF failure, went out and got some good contact cleaner from Radio Shack. It did clean all the crude from the sensor, improved the power but I still have a flat spot from a stop and some shifting problems and I can still smell some bad exhaust all of which is typical with a bad MAF. By the way, cleaning or replacing will not turn off the check engine light, you'll still need a scanner. The good new is Atlantic British has a good price, around $140, for a new MAF. Mike J.

12-22-2005, 03:58 PM	#11 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	Clean as a whistle! Well another check showed 8007, 8104, 9200, 6521 and 1400. (no 0734) Weird, only the 1400 code mase sense and if it was 0104 it would be a MAF. I started to look for a crack in the intake. Well I took the entire intake apart. Banged out the air filter and a cloud of dust came out. The snorkel behind the MAF was damp with the combustion chamber/throttle body cleaner I used last week and the barrel shaped reservoir attached to it had a bunch of dirty fluid that had run down and pooled in it from the cleaning. (my carelessness) Took the MAF off and sure enough you can see the microfine dust particles that make it past the air filter. On the hot-wire you could see the discoloration from the accumulation of brown dust, as well as in the channel the air runs through past the wire. (very slight but a light covering) I cleaned the wire CAREFULLY with electronic contact cleaner and wiped as much dust off the entire MAF as possible. I also found a wee split in the plastic where that reservoir attaches to the neck of the intake tube. I glued and ran a bead of silicone around the seal. So far so good, no codes and it still runs beautifully. Wish us luck! Thanks for the help with code 0734 !!!!!!!!!!!

12-31-2005, 03:35 PM	#12 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	Might be the solution The consensus from a few mechanics is that the computer thinks the third to fourth shift might be sluggish at some point.... throwing the 0734. No luck with the MAF sensor, it just runs even better and smoother now! ////M

12-31-2005, 05:41 PM	#13 (permalink)
darkknight1999 Mod. --- I'm watching you Join Date: May 2005 Location: Linwood, MA Posts: 330 Gallery: 0	Did you ever replace the MAP sensor? __________________ -John Some of my favorite quotes: "what you do in life, echo's in eternity..." "death smiles at us all... all a man can do is smile back..." 1999 Discovery II SE-7

12-31-2005, 08:30 PM	#14 (permalink)
////MPower Member Join Date: Nov 2005 Posts: 33 Gallery: 0	Nope! The truck only has 57,000 km (38,000 miles). I cleaned the hot wire on the MAF and it is perfect. The truck runs perfect and I mean, perfect. Maybe when I can see what all it takes for a dealer service I might have the tranny fluid changed and make sure the latest software is in the computer. It might just be a glitch. ////M

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