Porsche Boxster Technical Manual page 49

Boxster DME diagnosis 24
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Test point 4
Oxygen sensing Fault: Lean limit
range 2 and range I,
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DTC 26, 27, 28 Fault area: Fuel pressure too high or injection valve leaks.
Remedy: 1. Check fuel pressure.
2. Check fuel pressure regulator, vacuum connection and
fuel return line.
Fault: Rich limit
Mixture is so lean that the control is at its rich limit.
e Fault area: -Intake system leaks
-Fuel pressure too low
-Injection valves fouled
-Fuel pump delivery too low
Remedy: 1. Check exhaust system for leaks.
2. Check intake system for leaks.
3. Check fuel pressure.
4. Check fuel pump delivery.
5. Clean injection valves in ultrasound cleaning device
e or replace.
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2401 DiagnosisjTroubleshooting DME 24 -D 33
Printed in Germany -4, 1996 98624D1
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