Hi Guys,

Wondering if someone can point me in the right direction. I have just taken in a 1998 Range Rover that has just failed it's MOT on Emissions. The HC value is over 6% but the CO and Idle tests passed by fine. I have adjusted the lead screw down on the LPG vaporiser that adjusts the air fuel ratio, which allowed it to pass through fine last year, but this year it only dropped the HC to 5.9%. I have linked up a cheap diagnostics tool that shows a P1187 Error Code stating Oxygen Sensor Heater Circuit Short Upstream. My diag unit, a Konnwei KW808, allows me to see live data in which it shows B1S1 O2 sensor fixed at 1.020V and B1S2 flows around 0.5 - 0.8V on same occasions, but other times it also has got stuck on 1.020V

Unfortunately the replacement lambda sensor I ordered from EuroCarParts arrived and is far too big to fit in the exhaust. The main question however would be is replacing this sensor all that needs to be done to pass emissions?

Kind Regards,

Dave

If you take it in running on gas it should be tested using gas. If you're high using gas then something is seriously adrift.

O2 sensors are a favourite to go wrong. And MAF.

Simples,

Check the lambda on petrol.

If alls we'll pass to go, get £200

Don't change the lambda cause the lpg system says so.

When was lpg last serviced