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1998 Sebring V6 P1297 Diagnostic Help: Vacuum Leak, Fuel Rail, and Wiring Issues

Model: 98 Sebring V6 Fault Code: P1297 Posted: 2008-06-23 06:04

I believe this vehicle is equipped with a 3.0L V6 engine, which is known to develop driveability issues over time. A common cause of the P1297 fault code is a vacuum leak at the lower intake manifold gasket. Additionally, the fuel rail features a non-return valve that can restrict fuel flow—though this is less likely given the vehicle appears to be running rich. Another potential issue involves the large harness routed across the thermostat housing, which has been documented to cause wire chafing and loss of reference signals. Given these factors, I strongly recommend conducting a thorough diagnostic check rather than relying on assumptions or guesswork. The P1297 code specifically relates to an oxygen sensor signal failure, often linked to vacuum system integrity or electrical interference in the intake area.

Related fault codes
P1297
Comments (5)
Anonymous 2008-06-23 15:30

I've never encountered a vehicle with such persistent issues—this is becoming increasingly frustrating. The car now stalls when cold, and I can't get it to start. The flywheel turns manually, so the engine isn

Anonymous 2008-06-23 17:05

Tow it to the dealership—it's clear that your previous professional mechanic was unqualified. You've likely already spent too much on unnecessary repairs and parts.

Anonymous 2008-06-24 05:18

Thanks for the input, Jeff. I replaced the flywheel, and now the car runs smoothly—though the exhaust noise has increased noticeably. After a half-hour drive, I noticed a new code: P0138 (O2 sensor voltage issue). While it's possible this is related to a clogged catalytic converter, the fact that exhaust noise increases before the cat turns from cherry red to dull suggests a potential failure. I was also told that a failing flywheel can disrupt the crankshaft position sensor reading—this may have contributed to worsening performance just before the flywheel failed. I'm now approaching the end of this repair journey.

Anonymous 2008-06-29 10:29

It's worth considering whether the O2 sensor wiring was damaged during transmission removal, as that could cause intermittent signal loss or misdiagnosis.

Anonymous 2008-06-29 12:00

unless the 02 wiring is damaged from the trans removal!@