Question about 2002 Land Rover Freelander
Hi, 2000 Landrover Freelander 1.8 petrol, failed three MOT emission tests for high co reading.
1st test (with a cat which when removed proved to be completely empty!) produced fast idle readings of 0.720 & 0.740 & idle reading 1.220. (fast idle max limits are 0.300 and idle is 0.500) 2nd test (new cat fitted) gave 0.670 & 0.692 at fast with 0.665 at idle. 3rd test (New plugs, oil & filter changed, air filter renewed, breather pipes cleaned and injector-cleaner added) returned 0.874 & 0.647 with 0.798 at idle. HC readindgs are well within limits and lambda too is closer to top, but within limits. Exhaust firm have today replaced new cat - said they had had a few faulty units - and it goes for 4th emission test on Monday. Any ideas or suggestions as to what this might be would be most gratefull appreciated. Many thanks.
Check both lambda sensors for breaks in wires and for open circuit on heater side of lambda sensor on the one under the car on the second cat,failed heater element will not heat gas engough for sensor to read causing false readings , also check for slow i.a.c valve on inlet manifold.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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