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Hi John,
2003 disco 88,000 with the servise engine light on and idiling really rough .I have a OBD11 reader, codes are p0130 p1171 and p0171 which says its the oxygen sensor in the first bank.
I then took the vehicle to Landrover and they said that it was actually the mass air sensor which was at fault,throwing off the other readings????? any insight?
Thanks, Darryn
Answer -
Hi Darryn,
the MAF failing can make your engine run really rough. Looks like your ems is very very lean.
O2 measures after the fact...so if MAF is adjusting one way and O2 sees results. Rare to have O2 and MAF fail at same time. Since its an '03, are you still covered under warranty?
I'd agree with the MAF as the culprit...but just in case, ask the dealer to swap it in temporarily to see if it solves the problem. IF YES...pay the bill. IF NO, you're not on the hook for a new MAF that fixes NOTHING.
Best of luck,
JohnMc
NB: Make sure they test drive the Disco BEFORE you pay the bill.
Hi John,
Landrover wanted 465 dollars for a new MAF and couldnt guarantee that it fixed the problem so I got one for 125 dollars from roverland parts.
Reset service engine light and it came back on 2 days later.
Only one code came back this time,p130 which is the o2 sensor.
My question is how many sensors are associated with that code because the Advace auto fellow says its 2....each being 110 dollars.
Anyways thanks for your help and a happy new year. Darryn
AnswerHi Darryn,
your '03 Disco has 4 O2 sensors; 2 before and 2 after the catalytic convertor.
The code, P0130, indicates an O2 sensor circuit malfunction on Bank 1, Sensor 1, which is the front sensor on the LH bank.
LR code means : "stoichiometric ratio outside operating band".
Could be a complete failure of just one O2 sensor, wiring or something else. Unless the O2 sensor is completely failed, its hard to monitor them with just a multimeter. The best way is to have your engine attached to the LR testbook and then the O2 sensors can be observed more carefully.
If, however, the sensor is "DEAD, DEAD, DEAD!", then replacing is the obvious solution.
Hope this helps,
JohnMc
