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  #1  
Old 07-05-2011, 03:26 PM
edge's Avatar
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Location: CT
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Help: CT Emissions failed PO455 & PO 442 cleared then PO 150??

CT Emissions first failed my 97 E420 w/ 187K miles with error codes:

PO455 Evaporative Emissions Systems Leak Detected (large leak) and
PO442 Evaporative Emissions System leak Detected (small leak).

I changed the gas cap and reset the codes and ran it for a few days and the CE light came on again so i took it to Autozone to read and they said it gave:

PO150 circuit condition (heated oxygen sensor bank 2 sensor 1)

Explanation: "The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio in the exhaust.

Probable cause:

1 oxygen sensor defective
2. fuel system running very rich or lean check other codes first
3. engine misfire condition- repair
4. fuel pressure very high or low-fuel pump or pressure regulator.

How is it that this new code appears and wasn't in the first reading? Is the oxygen sensor easy to replace DIY? Thanks.

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  #2  
Old 07-05-2011, 04:22 PM
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#2 and #3 would possibly be caused by #1, just pointing that out. O2 sensors are usually pretty simple to replace, they can be pretty tight after heating/cooling for so many years and the wires can become brittle.
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  #3  
Old 07-05-2011, 06:01 PM
edge's Avatar
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Location: CT
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BTW the car runs fine. I just stopped at CT Emissions and he hook me up just to see the error messages. The oxygen sensors checked out fine! The only error was a repeat of:

PO455 Evaporative Emissions Systems Leak Detected (large leak)

I'm kind of puzzled.
__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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  #4  
Old 07-06-2011, 08:27 AM
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Most likely you have several issues.

Don't try to connect them, they are NOT related.

Have you ever filled the fuel tank while running? if yes, then that can cause P0 455.

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