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Discovery II Discuss here about the second version of Land Rover's Discovery (Disco II) in this section.


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Old 08-29-2013, 06:09 PM   #1
hemicharger69
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Default Dang Check Engine Light!

2003 Land Rover SE, 84,000mi.

New Bosch Mass Airflow Sensor, New pre-cat Bosch O2 sensors, K&N air filter, 5W30 synth, engine rebuilt approx. 40K. Looks like new spark plug wires (blue).

OBD-II codes: P1170, P1174

Here's sequence of events:

MAS sensor replaced in May 2013- no check engine light
I bought the car in July 2013 - no check engine light
I replace with K&N air filter July 2013
I replace engine oil Aug 2013
Check engine light comes on Aug 2013 gives me P1170 and P1174
I replace both pre-cat O2 sensors with correct Bosch O2 sensors
Check engine light comes on Aug 2013 gives me P1170 and P1174



I have reset the codes but they keep coming back on. What is the issue?

Last edited by hemicharger69; 08-29-2013 at 06:29 PM.
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Old 08-29-2013, 10:06 PM   #2
Joey
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K&N may have killed the MAF Sensor... or you may not have the air box lid closed all the way.
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Joey
Cincinnati OH
http://www.customroveraccessories.com Home of the New D2 horn buttons!

http://www.usarovers.com/ (call for Rover parts ask for Nathan 502-222-5859)

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm

EAS fault http://www.rswsolutions.com

When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.

Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).
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Old 09-14-2013, 09:52 AM   #3
bgbrown125
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If using a KN, should I replace the MAF sensor?
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Old 09-16-2013, 07:15 PM   #4
Joey
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If the K&N filter was over oiled it can kill the MAF, you can try cleaning it with MAF cleaner and see if that helps... but I am not a fan of K&N filters, I have seen them do more harm then good unless oiled correctly.
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This forum is not used much... please go to:

http://www.landroverworld.org


Joey
Cincinnati OH
http://www.customroveraccessories.com Home of the New D2 horn buttons!

http://www.usarovers.com/ (call for Rover parts ask for Nathan 502-222-5859)

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm

EAS fault http://www.rswsolutions.com

When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.

Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).
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