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Help with OBD codes

Old 04-26-2012, 05:21 PM
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Default Help with OBD codes

I have a 2000 Discovery II with 160,000 Miles . I have many OBD codes P1590, p1171, p1412, p0134, p1129 and p0171, . While Im driving it seem the have a rich fuel smell from the exhust and shakes a bit while stopped. I think it could be a O2 sensor problem . only thing is which one. can anyone help me please.
Old 04-26-2012, 06:45 PM
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Did you just get the car, and have you had a service engine light on for a while?

If you just got the car, or if you've had that check engine light on for a while, I would clear the codes and see what codes come back on. I would also do a quick compression test on all of the cylinders. These engines are temperamental, but they can still feel pretty smooth, even when a valve or piston is starting to fail.
Old 04-26-2012, 10:10 PM
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P1590 ABS rough road signal circuit malfunction Hardware is OK, but SLABS ECU is sending an error (you'll be wanting to look up info on 3 Amigos)

P1171 System too lean (bank 1) Additive injector adaptive fuelling - lean limit exceeded LH bank (from driver seated position) - system thinks it can't compensate (adapt) to changing conditions. Sometimes related to dirty MAF, clean only when stone cold with real MAF cleaner, not carb cleaner, not moon shine, etc.

P1412 Secondary Air Injection System – Malfunction Bank 1 LH (Insufficient SAI flow
during passive test)

P0134 O2 sensor circuit no activity detected (bank 1, sensor 1) (Front sensor LH bank open circuit)

P1129 O2 sensors swapped bank to bank (sensor 1) Front sensors transposed

P0171 System too lean (bank 1) Multiplication injector adaptive fuelling - lean limit
exceeded LH bank

Kind of points toward front driver side O2. But if you have not done wires and plugs in many moons, consider that first, and clear codes to see ones that return. Also check wires and connectors on O2 sensors.
Old 04-27-2012, 08:45 AM
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Besides the 3 amigos, first go buy 4 new 02 sensors, you are way past do to replace them, then clear the codes and you should be OK.
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