Range rover

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Hi all please could someone help me can't read ECU on my 2003 range rover HSE auto 3ltr td6 I have found heater plugs relay is reading dead short would that drop battery power and stop me reading ECU thanks in advance
 
Hi all please could someone help me can't read ECU on my 2003 range rover HSE auto 3ltr td6 I have found heater plugs relay is reading dead short would that drop battery power and stop me reading ECU thanks in advance
If the relays actually shorted out and keeping the glow plugs energised, that would drain the battery PDQ and cause all sorts of problems. However low battery voltage can also give you false readings.
 
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