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If you hear exhaust noises that are louder than usual, check MOT expiry date of your car and get your exhaust system examined and fixed to prevent a MOT failure. Your engine will sound abnormally loud if your flex pipe is cracked. It's possible that your pipe is making a hissing or tapping noise that gets louder as the engine speed is increased.
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4 Symptoms That Your Exhaust Flexi Pipe Is Leaking or Deteriorating Bad odours - If you can smell fuel while your engine is running, you definitely have an exhaust leak. Hazardous vapours with a diesel fuel odour can enter the engine room if you have a flex pipe exhaust leak. As mentioned earlier, if you check MOT historyof your vehicle online and a previous MOT failed due to the emissions test, the culprit could have been the flexi pipe. Refer back to the repair invoices (if any) to confirm what steps were taken to fix this issue.