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Dear Mr. B.,
Hope you're well. Thank you, for the explanation. I'd check for fault codes using the ODB readers, on the front face of the driver's-side strut tower. If no codes show, i.e., if all readouts are 1-1-1, then, I'd try to re-set the Check Engine Light (CEL). To do that, disconnect the negative battery cable clamp from the negative battery terminal, and wait 20 minutes.
Before cutting power to the entire car, be sure you have handy the radio security code. If you do not have the radio security code, call a Volvo dealer's service department and provide the Vehicle Identification Number (VIN). If the radio is a Volvo unit, but not that installed at the factory, you'll have to remove the radio in order to get the radio's serial number. Each radio has a serial number, which I believe a dealer service department can use to get the security code.
If the CEL remains lit after power is restored, I'd inspect the exhaust system for other damage, e.g., a failed oxygen sensor, damaged catalytic converter, etc.
An impact sufficient to separate exhaust system components could have done other damage.
Hope this helps.
Yours faithfully,
Spook
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