Check engine light is flashing when engine is load bearing

Tiny
PURPLEFROG7419
  • MEMBER
  • 1999 VOLVO S80
  • TURBO
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Check engine light started flashing the other night, but only when load bearing. Parked it. Took it to mechanic, tune up, spark plugs changed. Coils were done last year. The O2 sensor does need to be replaced. Mechanic not too familiar with Volvo. Could the sensor be what is causing the check engine light to flash? The tune up sucked up all my spare cash, so is it safe to drive?
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Tuesday, December 20th, 2016 AT 2:26 PM

3 Replies

Tiny
LOU P
  • MEMBER
I have seen many issues with failed coils even if they are new. Also, the brake booster can leak air causing a rough running issue. If the engine runs differently when pressing the brakes I would suspect a faulty booster. New parts can fail just as easily as old worn ones.
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Tuesday, December 20th, 2016 AT 4:45 PM
Tiny
PURPLEFROG7419
  • MEMBER
Engine is actually running great, especially after the tune up. The Check engine light has been on since we bought it from our former mechanic, who we had trusted when he said everything the car needed was still minor. He said the light was on because the middle pipe needed to be replaced, but it was nothing big, just made the car loud. I trusted the wrong person.

Now the Check engine light only flashes when the car is load bearing. No shaking, no rough engine. The tune up took care of the engine misfiring. I know that one of the O2 sensors needs to be replaced and I just wanted to know if that could be why the Check engine light flashes.
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Tuesday, December 20th, 2016 AT 6:52 PM
Tiny
LOU P
  • MEMBER
The light flashes when the engine is misfiring. So the engine is not actually running as good as you may feel it is. As soon as it starts flashing drive to a parts store and do not shut the car off. Have them read the codes. It will tell you what cylinder is misfiring.
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Tuesday, December 20th, 2016 AT 7:15 PM

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