I know this is very off topic but I just said I give ye all a try. Here's d story.
My Dad picked up a '02 Honda Accord about a month ago. Loves d car but it kept bringin on the amber 'Check Engine Light' on the dash. After much diagnostics - a map sensor and an oxygen sensor later, the problem still is'nt fixed
The result is overfueling. A full tank lasts 3 days. I dont think this is normal even for a 2litre. My buddy who is an auto elec said last thing it could be is the ECU. A full kit is needed consisting of immobiliser, keys,ect. These are costly enough from Honda. Is this a common fault, can it be repaired or does anyone know if it could be something else?!?
Thanks I (he) appreciates any feedback. He's sick of me telling him he should of got a 23year old toyota

I couldn't say jack about Hondas, never owned one, but why dont you stick a call in to Icetronix? They know Hondas inside and out and may have an idea or point you in the right direction. Hope you get it sorted.

Is the exhaust leaking between the head and the O2 sensor, if this is happening the O2 sensor thinks the engine is running lean and will richen the mix to protect the engine. A small leak can suck in the O2 and create this problem.

It happened on my two and I couldn't hear the exhaust leak.

Here's a bit of reading for you on Lambda sensors (O2 Sensors)

www.picoauto.com/applications/lambda-sensor.html

The lambda may not be the problem, it could be down to bad servicing record.

Run some dipetane on a couple of tank fills and see if it improves, this will clean out alot of deposits on both the injectors and the fuel system generally.

Is the air filter clean

What condition are the plugs in, white, brown or black.

What MPG is he getting not much facts in "A full tank lasts 3 days" I often use a tank of fuel in a day but I may have driven 400 miles. Best way to calculate the fuel comsumption is to:

Fill the car and record the litres it took.

Set the trip meter to 0.

Drive till the car is empty, then refill it and record the litres, leave odo alone this time.

Drive till empty this time and record your total mileage then divide it by the total litres used and divide that figure by 5 and this will give you the current MPG.

Once you have a baseline figure you will be able to see what is helping things get better.

Thanks, Slipsliderg. Thats some good advice. will do exacly dat and get some readings. I'll have a look for some dipetane too. Filter, plugs and exhaust are fine. Got em checked too! Lookin at crowds who specialise in ECU repairs. Turbotech in Wicklow. Logic Automotive and Autokey both in Dublin. Anyone know anything good, bad or indifferent about them??

Cashy wrote:
Thanks, Slipsliderg. Thats some good advice. will do exacly dat and get some readings. I'll have a look for some dipetane too. Filter, plugs and exhaust are fine. Got em checked too! Lookin at crowds who specialise in ECU repairs. Turbotech in Wicklow. Logic Automotive and Autokey both in Dublin. Anyone know anything good, bad or indifferent about them??

No problem

Have you checked for fault codes from the ECU, if it has none then its probably ok, check the simple things first and as I did months ago on my NCT, start from the cheapest and work your way up. Getting somebody to look at the ECU could just give them a licence to print money, how about trying a different ECU from a scrap yard, not sure if that would mess up immobiliser codes though.

Have you looked for an Accord owners club who might be best to advise on known problems and point you in a direction.