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Old 06-24-2018, 03:32 PM
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User440 User440 is offline
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Hey folks,
I just did the head gaskets on my 2004 D2. Everything started up well and the engine runs smooth but I have a smorgesboard of error codes that are present.

Two other things to note (after resetting codes)
  • - While driving, the codes do not reappear. They only reappear once the engine is shut off and appear upon starting the engine.
  • - When starting, it takes maybe another second or two of cranking before the engine starts

I have taken the following actions thus far:
  • - Reset / driven / reset
  • - Removed / inspected / reinstalled MAF and intake
  • - Inspected closely all vacuum lines and sensors

Here are the codes I am getting after messing with things a number of times:
  • P0134 - 02 Sensor circuit no activity detected bank 1 sensor 1
  • P0154 - O2 Banks 2 no activity detected
  • Po135 - 02 Sensor heater current bank 1 sensor 1
  • P0155 - O2 Heater bank 2 sensor 1
  • P0161 - 02 Heater bank 2 sensor 2
  • P1451 - Fault code not found
  • P0445 - Evap emissions system
  • P0102 - Mass air flow current low
  • P0340 - Camshaft position sensor current bank 1
  • P1482 - Fault code not found
  • P0414 - Second air injection system switching valve short circuit
  • P0445 - Evaporative purge control valve short circuit
  • P0448 - Evaporative emissions system vent short circuit
  • P0102 - Mass air flow circuit low
  • P1884 - Fault code not found
Any thoughts? Everything looks good as far as I can tell, and I labeled everything before taking it off. Any input is appreciated.
Thanks
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2004 Land Rover Discovery II
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Old 06-25-2018, 05:17 AM
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Did you reinstall the ground on the drivers side head to firewall?
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Old 06-25-2018, 07:08 AM
discostew discostew is offline
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I would look at the purge valve plug. I can't remember what it can be switched with. But I do remember you can switch a couple plugs on that side. I think maybe the secondary air injection vac. solenoid.

When the system is picking on circuit faults it's always a circuit fault. You have other codes like the cam sensor current flow. You might have a harness trapped or something.
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Old 06-27-2018, 03:13 PM
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EDIT.

Almost there.... Apparently in my brilliance I made an error in routing the V belt. Down to only one error code now (P1884). I know there's a thread or two on this one, off to do some reading....
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2004 Land Rover Discovery II

Last edited by User440; 06-27-2018 at 04:37 PM.
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Old 07-02-2018, 11:47 AM
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Ok, looking for advice on next steps. I still have one error P1884. I have inspected the TPS carefully and cleaned the MAF well with MAF cleaner. I have also swapped out my current MAF with an unknown older Disco MAF and the error still remains.

In reading other threads, I did notice a few interesting values on my UltraGauge:
  • MAF 1 - 0.00
  • Instant MPG - Err

The slightly 'harder start' noted above also still remains. So given this, does it look like my MAF is bad?
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