Engine check light
- Thread starter Werebear
- Start date
Grayedout
Members
Have you had the error codes read?
Grayedout
Members
You probably know this already
Honda P0420 Causes
Honda P0420 Causes
- Faulty oxygen sensor
- Worn and internally failing catalytic converter
- Leak in exhaust system
Grayedout
Members
If it's starting to break up inside then won't do any good.
Decent O2 sensors are pricey for a reason, they tend to have some precious materials which are needed to generate an accurate unburnt oxygen reading. These cheaper sensors are most likely giving a false reading. Try getting some genuine second hand sensors.
The other thing you can try are lambda spacers. People who have decatted tend to use them to trick the ecu.
Honda Civic Type R FN2 Exhaust Lambda Sensor Extension/O2 Spacer M18 Fitment | eBay
90 DEGREE ADJUSTABLE LAMBDA BOSS M18 X 1.5MM. Simply screw between lambda boss and lambda sensor. This is fantastic item to solve lambda fitting issues especially when a car has had a De-cat pipe or modified exhaust installed this must be fitted to prevent the warning light from coming on.
www.ebay.co.uk
Thanks for the advice,this is all pretty new to me so appreciate it. Also in relation to what Grayedout was saying about the cat, I found a receipt for exhaust work which included a new catalytic converter so hopefully that isn't an issue.
Thanks for that, I looked at the sensor on the inlet manifold and it was Denso. I put some 30 quid intermotor sensor after the catalytic converter. Maybe this is the problem, it's not good enough quality.
Use genuine sensors.