Can anyone throw some light on this fault code?

FEM-Navigation
B1B00-49 (2F) Electrically erasable programmable read only memory - bad checksum in flash - System internal failure - internal electronic failure.

Which bit has failed and what do I need to do to fix it please?

Ah well. Non the wiser. Have booked it into the local LR Stealership on Monday for diagnostics. Will report back on what the Fault code means and it's resolution.

Unnecessary quote removed

You've given us the fault code but you haven't said what the problem is or symptoms are ??

Er... I don't know what the underlying problem is. That's what I ask for help and resolution with. All that I have is the diagnostic tool reporting this error:

FEM-Navigation
B1B00-49 (2F) Electrically erasable programmable read only memory - bad checksum in flash - System internal failure - internal electronic failure.

There are no overt symptoms that I can discern. That doesn't mean there aren't any, just that I'm not experienced enough to discern them.

Looks more like an ECU/Computer problem than a car problem. Probably the fault needs clearing then watching to see if it comes back. If you are not "experiencing the fault" not sure whether this is one that has an effect? May prove a needless expensive trip to the stealers .....  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

@Joe90. Yes I have cleared it down three times and it immediately comes back. As does P0174 (Too lean bank 2). So it's going in to have both issues looked at really.

I just don't like driving around with the check engine light on. It makes me anxious. And one day it could be masking something more serious.

Ah, we are getting more of the issues now  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

You think these error codes are related? The P0174 is quite intermittent but the B1B00 is constantly returning.

Mind you, I'm learning that everything concerning the workings of FFRRs seems interrelated!

Don't fret too much about the engine light. Is yours LPG'd? That normally leads to a lean burn which can be adjusted by your lpg mech (if fitted). My lpg 4.4 V8 (BMW) runs all the time on lpg and never had an engine light on until a new lpg tech over-tweaked it.

If you are just petrol, then it seems to point to something in the fuel delivery system, maybe a duff injector or summat?

No, not LPG'd. I thought it might be an injector issue. Tried some of that injector cleaner stuff in petrol tank. Didn't seem to resolve the P0174 error code.

Anyway, it's in with local LR tomorrow, so hopefully it will be resolved.

Gyre8 wrote:

I just don't like driving around with the check engine light on. .

Who does?

OK, here's an update:

LR Dealership have just said investigations are continuing, but they say that two new Catalytic Converters have recently been fitted but they are too small(?) and one has a crack in it. I asked how, if they were nearly new, how come one is cracked and the service desk guy said it may have happened during fitment (seemed a bit vague).

Don't understand the this as I don't know how/why anyone would fit (or be able to fit) incorrect (i.e. smaller) Cats.

The also said that one O2 sensor is showing a fault, but it may not be faulty(!).

Further update: Confirmed (i've been under the car whilst it was raised on a ramp) that someone has quite recently cut the exhaust and welded smaller, aftermarket Cats in. One of these recent welds is cracked.

The standard exhaust pipe is about 3 inches diameter coming off the manifold and the welded in pipe Cat pipe-ends are about 2.25 inches, with correspondingly smaller Cats. Thus the exhaust gas outflow is restricted

This is going to get expensive to rectify!

I do wonder why both Cats were replaced? Do some thieving scrotes still steal Cats?

Hopefully not expensive to rectify.

I've got a 2004 V8 running 90% of the time on LPG, never had an engine management light come on until recently. Initial diagnosis showed that the post catalytic lambda sensors had failed. Decided to change all pre-cat & post cat lambdas, one was practically welded in place so that meant dropping down one of the {original) catalytic converters. When the cat was inspected it was clear that it had started to break up, so replacements were necessary.

New originals are a horrid price, so decided to go with Direnza stainless steel sports cats (much cheaper). They turned out to be really good quality and fitted OK. With the new cats and lambdas installed and fault codes cleared all was well for a few miles, then the engine management light came back on - this was partly expected as the sports cats are less restricted than standard cats, thus the post cat lambdas were throwing errors codes. Simple fix - installed some lambda spacers between the post cat lambdas and the cats (they cost a few quid and simply hold the tip of the sensors a bit away from the exhaust flow). Worked a treat and no more engine management light.

Hope this helps.